Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be7fb9785d4f120…

MALICIOUS

PDF

81.0 KB Created: 2021-04-07 18:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 94667e644ee485b91c7f90179d621324 SHA-1: dc8cd5dc3a7d16949e1c2f98ec54f420f673c407 SHA-256: 2be7fb9785d4f120b2fcffc65e08ccb9757e3ff054153ebe9510c37e6792f23d
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-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://dafemum.ru/strik?utm_term=youtube+video+poker+jackpots+2020 PDF link annotation
    • http://fullstacket.online/rslogix_5000_support_for_firmware_revision_19.1lohuf.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/a2d37896fd.pdfIn PDF document text
    • https://rixabala.weebly.com/uploads/1/3/4/7/134730828/geravirorakufuziv.pdfIn PDF document text
    • https://gunimesugudux.weebly.com/uploads/1/3/0/7/130776745/07d2311fc78e.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/7663901.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/ieQXjhQ/eligible_for_rehire_answer.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/pagalword_bhojpuri_bhakti_song_2018fytxi.pdfIn PDF document text
    • https://sinekamawo.weebly.com/uploads/1/3/0/7/130776883/dedeginokuxufel.pdfIn PDF document text
    • http://vovpomnim.ru/suximemufemizanarupuqrbuo.pdfIn PDF document text
    • http://myirn.icu/bovizudurekinabegubapiwefbnwsf.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • http://instapriz24.online/21164856407ugton.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_d02e25fe484041e2929a20e311b50312.pdf?index=trueIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_f5bddd1db8da434091605c28815a1eb6.pdf?index=trueIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_27eb0b399a9942169e3aff1b68a6ddbf.pdf?index=trueIn PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_3fb0ceafa5b445ed9e0eb0d8b06d02a6.pdf?index=trueIn PDF document text
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_6e88662839964c53babbc9484bf1e30f.pdf?index=trueIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_8dcb6c26f9e240dca88f705c954f30b6.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_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 5612 bytes
SHA-256: 0a025a9de96a6e73a46c24cfa9c2dcdb9dbff4c87275a3135a26299c975799ee
font_01_sfnt_off0000ffe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 4552 bytes
SHA-256: 5bb42cd50adda8dba5d8ba712855b65ee9c1f71c169f694cdd5c4a33ed7bed49
font_02_sfnt_off000110b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 11196 bytes
SHA-256: 4219ef4b0f624102eaf8d2539aee4474e444a58433be47243838d1c7e925f00c

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