Malicious PDF — malware analysis report

Static analysis result for SHA-256 167868140464f38a…

MALICIOUS

PDF

81.1 KB Created: 2021-05-25 11:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4fc399126c4e9aefcbf895322ff5f4ec SHA-1: 2006750c675c72ffcd96f6dd7adb1ab7d20c5a86 SHA-256: 167868140464f38a019992f1baaac9dfeebec4faccf84fba8e866bcddc21aa77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link farm of numerous external PDF links, with one prominent URL pointing to a driver update lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the PDF structure suggest an attempt to exploit vulnerabilities or trick the user into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lozipotod.ru/strik?utm_term=realtek+rtl8191se+wireless+lan+802.11n+pci-e+nic+driver+update PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468814/normal_605fc09cb1631.pdfIn PDF document text
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/zivujami-poxekiwaxu.pdfIn PDF document text
    • https://verijijul.weebly.com/uploads/1/3/4/8/134861220/bf7a28f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_60467822a04fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418167/normal_5fcebd923b4c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477373/normal_6026f67511f42.pdfIn PDF document text
    • https://barutonujumajom.weebly.com/uploads/1/3/0/7/130739232/8382801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_60654994b6f43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481402/normal_60034131b0f27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/14f39a2b-83d4-45bc-a4d3-6515f63f7f72/when_a_guy_loves_you_but_is_scared.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf41a5cc-4428-4ea7-996f-592457372d44/wujinitudunotikugamufopo.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/55949853729.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/acl_reconstruction_rehabilitation.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/warriors_dont_cry_chapter_2_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/weber_spirit_e-210_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20841830-8625-4934-baf3-e17b738b8d6b/97705246062.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/essilor_eyezen_fitting_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab2b98fb-af46-44be-bfa8-1e6ca7dea19c/how_do_you_make_a_bench_out_of_pallets.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/assam_police_result_answer_key_2019.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 6028 bytes
SHA-256: ea4ffd3e094dbbe055514aebda4ecc3e1e2f152e698f4d334485a71b3171d9f0
font_01_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 11384 bytes
SHA-256: cc138a10207fb4120af8a10e0fd15c077c5ab33bf6924c1ffebd4f318164f63c

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