Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb220637f9d7d6f3…

MALICIOUS

PDF

78.7 KB Created: 2021-06-05 22:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0d19315128802394b8468710b9661c3a SHA-1: f0982d57a9156eca1d3c99f38d02e091a88e3601 SHA-256: fb220637f9d7d6f3c64c0f4ce51df38d3206cdb8223811698ac4ef47bc132c58
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 0.9993

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://catamma.ru/pbw?utm_term=asq+six+sigma+green+belt+practice+test PDF link annotation
    • https://ruwuzeget.weebly.com/uploads/1/3/4/7/134755445/9258709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_60411590e3d65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_606d2b67b0f33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_602eaeac3c353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_604468c26360c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451563/normal_5fe769c47919d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_60472da258076.pdfIn PDF document text
    • https://zonozedu.weebly.com/uploads/1/3/0/8/130874021/aff1d7aee88c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425909/normal_6034f04dd4852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490961/normal_6010e668379fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426270/normal_5ff8858adb749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493873/normal_605400f7542a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465125/normal_601ad597ddd38.pdfIn PDF document text
    • https://tatidadimu.weebly.com/uploads/1/3/5/3/135383915/padowu-bomeze-wokakirudelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_60128e6c75501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475563/normal_604d0012e234f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mulasamesi.pbworks.com/w/file/fetch/144500499/wukazugofuxobi.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/f/what_is_vishnu_sahasranamam.pdfIn PDF document text
    • http://lexibitite.pbworks.com/f/what_fat_burner_is_used_at_tropical_smoothie.pdfIn PDF document text
    • http://genarozep.pbworks.com/f/38351695321.pdfIn PDF document text
    • http://bijinim.pbworks.com/w/file/fetch/144593715/harry_potter_and_the_deathly_hallows_book_chapter_summary.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/w/file/fetch/144670830/7th_grade_expository_writing_samples.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/f/29850148467.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/what_is_the_theme_of_macbeth_act_1_scene_4.pdfIn PDF document text
    • http://togusan.pbworks.com/f/80958083535.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_off0000f3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 5576 bytes
SHA-256: b0faf127b1dfab4a59113b0816aef775aaed3561ad5a0729bb34cd9470992d2f
font_01_sfnt_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 11320 bytes
SHA-256: 216d8296fdf3efe41683233820b22e466f8bcf77253ae5840d407626e5833a3f