Malicious PDF — malware analysis report

Static analysis result for SHA-256 c479efd6558892ee…

MALICIOUS

PDF

72.5 KB Created: 2021-02-14 11:31:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 76545993a2bd58a9832fd850c742e984 SHA-1: 10e40dbf6a545d9d9af641ae890da65477ab5e7d SHA-256: c479efd6558892eefc6183d796ab50b7213c6a2a4fd1006b7c2254ef41418841
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

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://seumenha.ru/wb?keyword=exposito%20scion%20of%20abjuration%20guide PDF link annotation
    • https://cdn.sqhk.co/pasededi/gc87cig/94422705717.pdfIn PDF document text
    • http://hyipinvest.site/gananoxuxuwakavolukadkhzxz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463554/normal_5fe0d60278f14.pdfIn PDF document text
    • https://gitefitibed.weebly.com/uploads/1/3/5/9/135968717/7b6f5.pdfIn PDF document text
    • https://xovonugobo.weebly.com/uploads/1/3/4/6/134688771/5360031.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/bhahaja/belito.pdfIn PDF document text
    • https://rasozonikazip.weebly.com/uploads/1/3/4/9/134904665/3427418.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/jeghnjh/13396376542.pdfIn PDF document text
    • https://cdn.sqhk.co/tisumusef/bFiezVo/73538941552.pdfIn PDF document text
    • http://neuroncraft.online/intermediate_accounting_solutions_manual_chapter_4gyx7v.pdfIn PDF document text
    • https://cdn.sqhk.co/wexifidobafo/cMo17jg/44643356645.pdfIn PDF document text
    • https://cdn.sqhk.co/lomokubaf/WhgjETk/jolovavorurazodope.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lubesugoninop.epizy.com/catanzaro_informa_cronaca_sersale.pdfIn PDF document text
    • http://gijuvove.epizy.com/52730811105.pdfIn PDF document text
    • http://lodajozaki.rf.gd/tokyo_guidelines_2013_cholangitis.pdfIn PDF document text
    • http://zuzitubop.rf.gd/41004149842.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19B 5416 bytes
SHA-256: 6cf90cc4b47f8525674fda6424e0a8c852fe44e69c6453e2fc564711c549adae
font_01_sfnt_off0000e40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40F 10284 bytes
SHA-256: 69d7e391ca523b70e49de0f89a8cfd7253e8b23b29a68bf78acce9a31fb90a88
font_02_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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