Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ef6c158811392e…

MALICIOUS

PDF

88.5 KB Created: 2021-03-28 16:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d8ab52768d691d84ec72fdc7ce1d7bf9 SHA-1: 23c6a16e137921b503b079936f8f82282b78ad5f SHA-256: a0ef6c158811392e1318cbe6f15cffd02d1df4b91a4085303e26d8a5ad542032
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish for credentials. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification yielded a high probability of maliciousness. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/award?keyword=barron+s+sat+subject+test+math+level+2+pdf PDF link annotation
    • http://iblack.space/pasibk6x9e.pdfIn PDF document text
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/tekawirakazapataluvo.pdfIn PDF document text
    • http://onlinetiser.website/chevy_stepside_truck_tool_box23a0y.pdfIn PDF document text
    • https://balusapox.weebly.com/uploads/1/3/1/3/131380564/nogadagepaz.pdfIn PDF document text
    • http://cetop.xyz/dewasaftbc2o.pdfIn PDF document text
    • http://letxxnx.org/orvis_encounter_fly_tying_kit_video_instructionsmlyt9.pdfIn PDF document text
    • https://powotatetodo.weebly.com/uploads/1/3/0/7/130738650/dikos_bofodikeja_laxapurozolezi.pdfIn PDF document text
    • https://xonunate.weebly.com/uploads/1/3/4/4/134478107/3916006.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_5261f328f8d34017a884fa46be012e11.pdf?index=trueIn PDF document text
    • https://3abcc933-4059-444f-8e65-7077e95f005f.filesusr.com/ugd/44645f_4b7538e1baba4e0fa62fb6167efde6e5.pdf?index=trueIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_e3efa99be1b54f36b0a523b7a99f58ba.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_5c0e0bea381c443f80f0ec450c711f5d.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_53072785d9334fa5978aefbefdb8df82.pdf?index=trueIn PDF document text
    • http://tinipolevuzow.epizy.com/bili_bili_akh_babbal_rai_song.pdfIn PDF document text
    • http://liwupidejajetex.rf.gd/45276088991.pdfIn PDF document text
    • http://xogamix.rf.gd/biographies_of_famous_personalities.pdfIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_d2a583ea6f174e94bcbfe8850f5708e9.pdf?index=trueIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_b4cc301bc8a748ea9b9080b49e2bc8e0.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_7f20fa2b019a4862ae17496e43d4c3dd.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A30 5852 bytes
SHA-256: b3bb85552b6ce59b9526477c3222b9c4418777340bb8912edd250a0e4cc21def
font_01_sfnt_off00012e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E02 11268 bytes
SHA-256: ac943c2608d3ab02eb352f2fdf5382553f71111a85c788ec9c2b54c2eeaa55af

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