Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c8e2fd9bb43c92…

MALICIOUS

PDF

42.8 KB Created: 2020-11-06 19:43:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5e0886767cffba324b6f42c50b2e2a94 SHA-1: eca0443aed54e585724fecc46c7f606c0fe1bc3b SHA-256: 31c8e2fd9bb43c92a4a3548bc6b3fe47a214e58037b6ed5ddcbf3fa470594fea
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier strongly indicated maliciousness, and the presence of external URIs points towards a potential redirection or download mechanism. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a social engineering tactic, likely spearphishing, to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafffi.ru/aws?keyword=united+airlines+737-900+first+class PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410418/normal_5f95f1936988b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f8b329be023e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457604/normal_5fa53ca12124d.pdfIn PDF document text
    • https://sukanogijero.weebly.com/uploads/1/3/4/3/134333185/pulajox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f9048ce3eaa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_5f9c5e7c4ad35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://givolajokofe.files.wordpress.com/2020/11/japatewajaliwififu.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/mini_nutritional_assessment_form.pdfIn PDF document text
    • https://veliliga.files.wordpress.com/2020/11/naxoju.pdfIn PDF document text
    • https://falikajudepi.files.wordpress.com/2020/11/xafuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f6718b-3bb3-4cee-b5b8-b13a9bb4f268/80313517150.pdfIn PDF document text
    • https://zatejoru847961968.files.wordpress.com/2020/11/72489844693.pdfIn PDF document text
    • https://kovipuwixo.files.wordpress.com/2020/11/42635769341.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_off000067d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D2 5580 bytes
SHA-256: 36444c239d04a9e89cf01e96d182d2a80e332c9e6461a526278d13f0e740953c
font_01_sfnt_off00007ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE5 10380 bytes
SHA-256: 042807089143401931614d0b976db4eb8d069c855269070c8012889c56e977c6

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