Malicious PDF — malware analysis report

Static analysis result for SHA-256 a978641a5e56f1f0…

MALICIOUS

PDF

78.8 KB Created: 2021-06-10 15:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 597417fd87211a809a027ae5c4d69c60 SHA-1: 3edb880570e251991469b089c54a6bf0be15ef5e SHA-256: a978641a5e56f1f0033b890876bd7fb5382d05862e476eda07c5de839b0d7903
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URLs, with one prominent URL pointing to 'synerhu.ru'. The document body is heavily obfuscated, but the presence of multiple external links suggests an attempt to redirect users to potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://synerhu.ru/pbw?utm_term=nusrat+fateh+ali+khan+remix+mp3+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415300/normal_6065c462d8044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_5fda72b40fa10.pdfIn PDF document text
    • https://finedogu.weebly.com/uploads/1/3/4/7/134749629/nokovujonazisixazo.pdfIn PDF document text
    • https://jeputuzomum.weebly.com/uploads/1/3/1/3/131398597/eae2799d407a6eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_60274085d0f06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390069/normal_5fdc3b17143ce.pdfIn PDF document text
    • https://maninuwag.weebly.com/uploads/1/3/4/5/134577581/3902830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444371/normal_60217f5c0ac2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402533/normal_5fe9f18cb5bef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_60147f51741cf.pdfIn PDF document text
    • https://jidobatixinel.weebly.com/uploads/1/3/4/7/134726111/mumuvuwowem.pdfIn PDF document text
    • https://wutiboduselojo.weebly.com/uploads/1/3/4/6/134665342/fcd790f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410731/normal_5fd9e11b5e6c8.pdfIn PDF document text
    • https://dusimajigedavim.weebly.com/uploads/1/3/1/4/131453199/e4af66b7ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_5fe908f1e643c.pdfIn PDF document text
    • https://zufesuvagudinaf.weebly.com/uploads/1/3/4/3/134321689/sulag.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/c85a78dc-74c7-4ed3-bfb8-80ea6afe126f/read_the_wheel_of_time_series_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88dacf70-24f7-43a2-8061-851deb57b333/sonicwall_tz_105_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/882cbdd3-64ec-4afa-b61e-c3cb0a4a298d/how_to_change_cisco_dpc3825_router_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92247404-706b-4763-a6be-8a419c98cc57/what_is_the_symbolism_in_the_veldt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae8421e9-368c-4cdb-8fb4-e45a591fccc9/what_is_the_youngs_modulus_of_aluminium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ebffced-2e81-42d9-b60a-c1f9cf793151/gefedojubevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/155d06d9-777f-47ee-b0aa-af01b9320c4a/63727333096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/678de072-d42c-4649-8865-04fb00e2f0b4/how_to_create_a_login_and_registration_form_in_wordpress.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_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 5636 bytes
SHA-256: b63d972daf5a22446f2b5f3961addc4d60f4e46efb60b988defe2cf3f4360f6a
font_01_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 10868 bytes
SHA-256: 862876133b4901721463b25fa04183c526177296163633808b6d3aa366d3abb8

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