Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c55185c7535a91…

MALICIOUS

PDF

88.1 KB Created: 2021-06-06 18:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 55fd89db1f759a01d720426f0ae307da SHA-1: 9eeb1ed2498a031de180d53b89c41720f401d8a7 SHA-256: c9c55185c7535a915b610c94dfce0de15947789d7df622c0cc59d731e3c3e21c
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm. The primary URL, https://nomylo.ru/pbw?utm_term=jaybird+x5+release+date, suggests a potential phishing or scam attempt by directing users to a site with a search-term-like parameter. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nomylo.ru/pbw?utm_term=jaybird+x5+release+date PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382418/normal_604a2aea83477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446643/normal_60140a44c6f3d.pdfIn PDF document text
    • https://jupufafel.weebly.com/uploads/1/3/2/7/132740723/22e9efa10b143.pdfIn PDF document text
    • https://jiketajaw.weebly.com/uploads/1/3/4/4/134464131/lixipafuvuwibuzep.pdfIn PDF document text
    • https://masezinonorokun.weebly.com/uploads/1/3/4/6/134685416/nekukuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480878/normal_60590c22510c5.pdfIn PDF document text
    • https://nuvofuvulaxak.weebly.com/uploads/1/3/4/6/134694516/08c163633.pdfIn PDF document text
    • https://zulijijala.weebly.com/uploads/1/3/0/7/130740393/fd1113165b55e05.pdfIn PDF document text
    • https://wegejazibeb.weebly.com/uploads/1/3/5/3/135305894/nazanur.pdfIn PDF document text
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/netofup-liwirula-nuxuvuvolixo-wokaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_6056ef95960f3.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/22afa43c-76d7-4ba5-b8a8-18cf72d60777/how_to_reset_omron_pedometer_hj-321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/695eb69f-f659-444e-ab4e-5ada1d02133a/how_to_write_a_script_in_21_days.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd625cd5-6281-44c1-982c-11a69958370a/55097531203.pdfIn PDF document text
    • http://serukula.pbworks.com/w/file/fetch/144681582/2109976510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d6d5d0c-fbca-481f-a71a-40672cdf34a7/taborezigatiked.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/w/file/fetch/144674979/bexelezafivudenadusib.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/fojevekemetenusurideko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ee97c06-a342-4331-a870-9994916d0b91/58562434696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e666b1d-6dc1-45e5-a4ee-b808b16f4e7b/lepajoxizuxafo.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/w/file/fetch/144642330/tuwoniba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd7760c-2656-4dca-b491-8a5f77d50eb9/97068548527.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/w/file/fetch/144444147/17853540076.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_off0001152a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152A 5240 bytes
SHA-256: 7939dcdc88e0c3929afda47f90f4251362e5244a1009e88ff41b806634e2d99a
font_01_sfnt_off00012715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12715 13420 bytes
SHA-256: 9e37c5b09d6c3c9b5c3db8b0e8b0947de3d32856d38c2f32d8d72456bb170756