Malicious PDF — malware analysis report

Static analysis result for SHA-256 da370af7e3bf7d9d…

MALICIOUS

PDF

81.7 KB Created: 2021-03-22 01:19:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 926ebff4a0665a9856f4d3e65d87dd9b SHA-1: b06060054e994332d92639b89da944f067509a1d SHA-256: da370af7e3bf7d9d2edb15099cc620c87eca44dbb1507161990a246f786a270b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content, likely for malware distribution or phishing. The presence of a download button lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/wix?keyword=minecraft+pe+apk+free+download+full+version+0.14.0 PDF link annotation
    • https://rikekipodoze.weebly.com/uploads/1/3/0/7/130776447/1768752.pdfIn PDF document text
    • http://stakingyfi.com/is_the_story_of_the_shack_truejcvwh.pdfIn PDF document text
    • http://arendagg.xyz/apn_nrj_mobile_pour_android2bbzu.pdfIn PDF document text
    • https://susokeruno.weebly.com/uploads/1/3/4/6/134656617/c8ac9731.pdfIn PDF document text
    • https://xokekujederal.weebly.com/uploads/1/3/0/9/130969763/c824b031.pdfIn PDF document text
    • https://morozosewiveloz.weebly.com/uploads/1/3/4/3/134387595/vejoj.pdfIn PDF document text
    • http://barashik.space/wofiwabatubijixfm6.pdfIn PDF document text
    • http://save50.pro/cotisation_formation_professionnelle_chef_d_entreprisecz8ix.pdfIn PDF document text
    • https://janikopet.weebly.com/uploads/1/3/4/6/134690806/e37d89.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/what_stretches_to_do_before_lifting_weightsto2fa.pdfIn PDF document text
    • http://hargotel.xyz/jeruvatukedawajekowezufks66.pdfIn PDF document text
    • http://zeropium.com/rosivenezifuxadedivimeria4znj.pdfIn PDF document text
    • http://blaugrana.ru/download_mod_thunder_assault_raiden_strikercmckw.pdfIn PDF document text
    • http://yarrebitteh.online/mobutosiburixateppt49k.pdfIn PDF document text
    • http://idealica-itufficiale.website/watch_nfl_live_online_free9rlxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_a97366f5423e4ad5aa655656bcb14613.pdf?index=trueIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_c5d7810234c543aa81168b0f03e09e49.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d8a6ba5-ad4e-45f3-88bc-744c257e9241/18945429907.pdfIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_49960ba4197b42fbbcfb355466c8ab9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1349c573-c509-43bd-ac23-44a3c38295fa/sears_kenmore_dryer_repair_help.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f28abd3-000c-40d0-a597-f34485b981d1/the_bridge_called_my_back_quotes.pdfIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_453fe9b4de77485f957bb0e00525ec5d.pdf?index=trueIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_39045cf25b7f4601aeb477c4ec80334e.pdf?index=trueIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_16f22df3dd3e4f86a86d11df1a6e5ded.pdf?index=trueIn PDF document text
    • https://b09d99c6-da67-4e55-b5b3-baceba093817.filesusr.com/ugd/a69c6c_5b486d1a3d8b4c7e912a1c1f30cc98b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80a76159-45cb-4aed-9973-71ede93482ce/navy_leadership_training_powerpoint.pdfIn PDF document text
    • https://2e21b658-2967-4279-8f18-a03590b678a5.filesusr.com/ugd/f5e1b2_2f5f2f4d98094b839f98ec931ab60159.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 5568 bytes
SHA-256: 3d5a08434442daa699c6a6c374bcffe05001a102cb9c21eb1f78de077b10ceb4
font_01_sfnt_off00010596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 10844 bytes
SHA-256: c71c52d2053b47a4a2091fa5fa6c5d96296a4dca3cf55cc37168e245971ac586
font_02_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2