Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b9cb821e3206af…

MALICIOUS

PDF

81.5 KB Created: 2021-06-13 10:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a94ca3f2c1a6e4696c3816e0cf3d9b01 SHA-1: a831e26a94d735465401996a04c4294dd5e12e94 SHA-256: 60b9cb821e3206afd569e3800d0c7fc3249011ef16f0011c6c53c84794269041
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, identified as a link farm, likely for SEO manipulation or to distribute further malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF being detected as a phishing trojan. While no scripts were extracted, the presence of numerous external URLs suggests a phishing or content distribution attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=dried+chickpeas+nutritional+information PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403804/normal_60c52ea5c1cc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477401/normal_5fc95da55914e.pdfIn PDF document text
    • https://dapinolun.weebly.com/uploads/1/3/4/7/134762022/5055131.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374847/normal_5feb5d3f80725.pdfIn PDF document text
    • https://gugekomu.weebly.com/uploads/1/3/0/9/130969097/disuzovejo-nezogobo.pdfIn PDF document text
    • https://wejigawavopon.weebly.com/uploads/1/3/4/3/134305277/funari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_6024860e41960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_60bb2e8088ef9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479675/normal_605d688a7db95.pdfIn PDF document text
    • https://detazemunowovi.weebly.com/uploads/1/3/4/7/134704720/2671995.pdfIn PDF document text
    • https://dekoreriso.weebly.com/uploads/1/3/7/5/137501726/1749547.pdfIn PDF document text
    • https://bikojeril.weebly.com/uploads/1/3/3/9/133999271/6cce88deb807.pdfIn PDF document text
    • https://bufuxilanu.weebly.com/uploads/1/3/4/4/134402831/8625a3e819bf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426072/normal_604b8c00e38f6.pdfIn PDF document text
    • https://xasibegofijuga.weebly.com/uploads/1/3/4/7/134731363/napubexenus_banodoretuv_jiratud.pdfIn PDF document text
    • https://pamiwawoxok.weebly.com/uploads/1/3/6/0/136089952/80962.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/7ebcdfec-3fa9-4e82-a57f-bf1577e46e70/64018571906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4cf950-421a-495c-aafc-9be3a57da1f9/63235617794.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/f/fetamewedomoxijonefadete.pdfIn PDF document text
    • http://wafijovodek.pbworks.com/w/file/fetch/145153851/xifowukagujexitivafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e77ea817-549f-427f-aedf-b26da5f3a297/a_deeper_love_inside_book_review.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_off0000f423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 5456 bytes
SHA-256: bc17f16285b37ef7a247c847ad66c396fffbb8a0e70202582fe25d89b0ec5a16
font_01_sfnt_off00010687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 11636 bytes
SHA-256: 0bb9a49bd1c1b38743f0e4c3f2f0097c8d51401d679a289d6ff283335ace20bf