Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab8cece2efbbfc3…

MALICIOUS

PDF

78.7 KB Created: 2021-06-15 09:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 294a8e1ef84f4b518b53c6345494874a SHA-1: 958ece8751fc07d3d448a06888a0ba0032e2ce92 SHA-256: 2ab8cece2efbbfc3645b7089858a9c3d6f05e3ff6fbcbfe963923dc89e090662
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • 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://catamma.ru/pbw?utm_term=how+to+check+dipole+moment PDF link annotation
    • https://ralubimuxafoku.weebly.com/uploads/1/3/4/3/134373731/8581710.pdfIn PDF document text
    • https://kelonefak.weebly.com/uploads/1/3/2/6/132683111/347373.pdfIn PDF document text
    • https://wixetaduzem.weebly.com/uploads/1/3/4/4/134471786/koxijiguferisok_nuretani_vanezapajeza_lurimejez.pdfIn PDF document text
    • https://pusesame.weebly.com/uploads/1/3/4/6/134662227/5399d.pdfIn PDF document text
    • https://vefujavud.weebly.com/uploads/1/3/4/8/134857174/piwodawapiwopud_texavit_bomugurodude.pdfIn PDF document text
    • https://kasozufadoji.weebly.com/uploads/1/3/4/5/134523760/f26f8938a9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459324/normal_6023ada250265.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393190/normal_5fe129b18d8b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427780/normal_6032f21a9fe79.pdfIn PDF document text
    • https://modisogisutoval.weebly.com/uploads/1/3/5/3/135390942/pozasepebizat_topod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402956/normal_5fe1459fc5ca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461791/normal_60674177f2e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427514/normal_5fd9a3d70fece.pdfIn PDF document text
    • https://zanijiwudiv.weebly.com/uploads/1/3/5/3/135349447/132121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473410/normal_60bb555a96e9c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4489237/normal_60b1107530dc5.pdfIn PDF document text
    • https://jerumegilaguro.weebly.com/uploads/1/3/0/7/130776399/9591960d1177c9f.pdfIn PDF document text
    • https://voteriboxovoviv.weebly.com/uploads/1/3/4/3/134352377/2156503.pdfIn PDF document text
    • https://xafosaxit.weebly.com/uploads/1/3/1/8/131859261/3369131.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380531/normal_5ff421a209068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417118/normal_6041ffa0da603.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/3056c35e-7afa-43c6-8c97-a6f8d822f71b/adobe_photoshop_video_tutorial_in_bangla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ded546-ad44-4463-b5e7-a7eeb5d8130c/27559350609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47a5421a-cf03-4d11-9b69-0d29582fed4a/self_reliance_federal_credit_union_astoria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb3f162e-7c25-428e-ac90-fd1445e19cd1/how_to_see_vba_code_in_excel_2007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23c2bae-44ea-4bbf-9e3b-2297f0f1b9b5/kumumeme.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_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 4948 bytes
SHA-256: 47324a3b37425d4dbb9ea747a9ce72801da7faadb5904a6cf5e171975cb92e5f
font_01_sfnt_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 12020 bytes
SHA-256: 8e5b8bc153e70881046c43e694b727cf7b5742a793e2827434602c4bb0165f1f