Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ca41a5af564c23…

MALICIOUS

PDF

73.0 KB Created: 2021-02-22 00:57:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bc0f67732c0ffef4cee75e6755ee3be6 SHA-1: 50ccb8c82ff931866081e3c7f91436531e4f21b4 SHA-256: 06ca41a5af564c23707ae162bde5b80340f45cd515ea03471591dae07ae75640
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards the distribution of malicious content or redirection to phishing sites.

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://leonvi.ru/wix?keyword=utk+final+exam+calendar PDF link annotation
    • https://cdn.sqhk.co/jowapezo/icuKdhh/mewunizemuxofuwukotatem.pdfIn PDF document text
    • http://serdyukov.pro/46816761983fm3zo.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/jasidipel.pdfIn PDF document text
    • http://repair-foto.ru/31445019208jtp6j.pdfIn PDF document text
    • http://ketosimple.online/debevamivifiteregezidfxd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_5fdbe20fa0546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470019/normal_601e512503ba5.pdfIn PDF document text
    • https://cdn.sqhk.co/napefabet/0jhhtfN/34079722876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_60130636d4851.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456985/normal_5ffbdef2c6445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_601633dd7a037.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/dcu879L/3886134342.pdfIn PDF document text
    • https://darefosal.weebly.com/uploads/1/3/4/6/134601331/88d79f3dd06.pdfIn PDF document text
    • http://solapp.xyz/43570641265sl22j.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://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_off0000d463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD463 4792 bytes
SHA-256: 2eefa496730a42d5fcd77fdf8b40f1dcf1dd465fcc16a10476d9db68528dbcaf
font_01_sfnt_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 10580 bytes
SHA-256: 5c17a967e73468e49ff68e4216a8a17ee2a4939708465ec568165d20b193f387
font_02_sfnt_off000108c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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