Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6b12c3a7724cbc…

MALICIOUS

PDF

82.8 KB Created: 2021-03-30 19:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7f0427fc7d026d2c3522c9fc0eee8513 SHA-1: 59f18785d34a901b37905fdf4b336f19a1d9664c SHA-256: cb6b12c3a7724cbc0033159a555ec0b21dcdd4a1d3f3f6e9a39419bb0c1bac33
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 0.9998

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.
  • 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://seumenha.ru/123?utm_term=comment+transformer+une+page+html+en+pdf PDF link annotation
    • http://fakts.design/what_is_a_woman_pimp_calledlkoir.pdfIn PDF document text
    • https://ziziwatir.weebly.com/uploads/1/3/4/7/134713039/955672.pdfIn PDF document text
    • https://tofaxewa.weebly.com/uploads/1/3/4/6/134672655/1265ed.pdfIn PDF document text
    • https://wolapegod.weebly.com/uploads/1/3/0/7/130776073/gewesekavok-besujemag-nujedezutataxe-ranukusukexad.pdfIn PDF document text
    • http://tosety.xyz/38203916056icr21.pdfIn PDF document text
    • http://zespodsvetkoy.site/66959374384grw9.pdfIn PDF document text
    • https://rofewure.weebly.com/uploads/1/3/3/9/133999154/5568972.pdfIn PDF document text
    • https://tebugusenaj.weebly.com/uploads/1/3/4/8/134870623/2174870.pdfIn PDF document text
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/jimakesatunat.pdfIn PDF document text
    • http://ighelperscenter.com/fuwinedutedakoresalodajefupin1.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/6b7f8.pdfIn PDF document text
    • http://dutov.org/jorududuga6au7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4e4608fd-868e-43f5-b6ba-14e5e4b50785.filesusr.com/ugd/b1f235_04a71955820148f09e56c62d0a4bbfb9.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_33a0fe0f5a5945fe89335dabf8d5fbd9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/15415899452.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_b2cb5d0f20fe41a2a35dfc43c8ba247d.pdf?index=trueIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_4a84962c9cfc4f4cb7d1b98974f886f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/88001681939.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_off0000fdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 5360 bytes
SHA-256: 60a87f5eb551b4d8f2d11729fd603f9868cff615eab1e39549fdb73a42777406
font_01_sfnt_off00010ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFD 13740 bytes
SHA-256: 4c7e92c57d4c8a6077a6cfc20e7001f87d07d702928e1c617a5271c22dfcf21c

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