Malicious PDF — malware analysis report

Static analysis result for SHA-256 fabcc9998b7b1b44…

MALICIOUS

PDF

83.5 KB Created: 2021-03-14 03:07:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 93946dc2b49868265167378c0e94c442 SHA-1: e36ca9cbf3aa27ec9c11227645eaf8c5512add53 SHA-256: fabcc9998b7b1b44ed5f9aa83264b2b1b8f837df00f71ba09899b80f0bf5b4a3
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 domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, likely used as a lure for further compromise.

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://xezojetit.ru/123?utm_term=fairest+lord+jesus+piano+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383450/normal_60228b883f243.pdfIn PDF document text
    • http://janexik.22web.org/immunization_schedule_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445726/normal_5fe8f4e331e48.pdfIn PDF document text
    • https://litazivufili.weebly.com/uploads/1/3/4/3/134305244/juliduwolo-modix-burafamipoduwe.pdfIn PDF document text
    • http://genemot.22web.org/15925284759.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484122/normal_5fe5352396cf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409992/normal_6038b9469cb8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410988/normal_5fe529b38fa0a.pdfIn PDF document text
    • https://katalulipof.weebly.com/uploads/1/3/2/7/132710678/letodamisazaxarami.pdfIn PDF document text
    • https://nalufubuxozukex.weebly.com/uploads/1/3/4/4/134479837/6929960.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487631/normal_5ff23b70ece62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374956/normal_5fe021e8e6e0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404723/normal_602fe463a58fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gulapore/bedingte_formatierung_bertragen_excel_2010.pdfIn PDF document text
    • http://vutesupazidoz.epizy.com/lexafedalavaxexuluno.pdfIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_521dff62cf45406187bb6a50a0324593.pdf?index=trueIn PDF document text
    • http://kitalanexu.epizy.com/92760523450.pdfIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_6f35dd852eb645d084d48d99253df5cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gonima/emotions_flashcards_for_kindergarten.pdfIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_f782c9abd047438fa0643c29a97f4c34.pdf?index=trueIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_c1da58f52fb1449fb745897c302d5581.pdf?index=trueIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_ec5fb6b4fccc49eeac898373fe711b9c.pdf?index=trueIn 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_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 5080 bytes
SHA-256: 7d0c08de264a6282c97a284a2e6b5dff62cda917adaf28937d5cc33b1e861516
font_01_sfnt_off00011871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 12380 bytes
SHA-256: a0e2a7b4b9e14bebf4ad5987fb3c9ee92cde8d753cc7b956ea40d84eb61e081e