Malicious PDF — malware analysis report

Static analysis result for SHA-256 8670d858525a4303…

MALICIOUS

PDF

68.0 KB Created: 2020-12-18 12:13:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f56157db9afa6a846dfd65b9df4594c6 SHA-1: 4af7f59e6686e6b8f3b22ad06f05dded35628a4a SHA-256: 8670d858525a430372ea9f9d4c50fd371aa921cf19680f7fead2c0aa6e7bc02e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/aws?utm_term=activities+for+letter+formation+preschool PDF link annotation
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/vexozonoreziv_wedezupujejudo_pitafev_vokiwuxo.pdfIn PDF document text
    • https://fexagoresex.weebly.com/uploads/1/3/4/3/134337575/914b2cb9.pdfIn PDF document text
    • https://xodasolilixodi.weebly.com/uploads/1/3/4/8/134874129/jizifup-zirulubukobuvil-gemirodopobol-puxunajaxiv.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/745971.pdfIn PDF document text
    • https://sivagodumojuji.weebly.com/uploads/1/3/4/2/134235915/8390757.pdfIn PDF document text
    • https://rotufufuzefido.weebly.com/uploads/1/3/4/9/134901673/bajufozujowajulo.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/a6b7a42f-3847-4b71-b3ca-69c1b1e3b0b4/test_de_jobe_fisioterapia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73423c46-9ddc-4c96-87fb-8f09f725f073/cbap_ccba_certified_business_analysis_study_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc67f67ab79f442f2500a09/t/5fcebd8ab4902412734d3ca2/1607384458681/age_of_empires_2_definitive_edition_steam_mods.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5720fc6229360eccb86af/t/5fcbfd3e5177ea328cacfd74/1607204159184/psoriasis_cream_walgreens.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f41f116eb00e3c4c3887/t/5fce22b31e1a4d7de15345e5/1607344819866/download_game_sword_of_chaos_mod.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_off0000ce6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6A 5304 bytes
SHA-256: 9ba2d4f0562d62bf9cf4844dc527ca036b1448e6c3f63cb7e69d775c81015fe5
font_01_sfnt_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 10188 bytes
SHA-256: 5d5442e4676c973fb94a8e0cd1a15f1f54130fe52413372937d4ebae29004ec7

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