Malicious PDF — malware analysis report

Static analysis result for SHA-256 aadc3be5cb2ecde5…

MALICIOUS

PDF

88.2 KB Created: 2021-01-11 19:04:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 79ce080cfeaf956a2c6eb89f3f2a5c28 SHA-1: 56ef8418bef01f4912e6452374b55d1b22f1cec4 SHA-256: aadc3be5cb2ecde5eee676fc33640f7877f017b89d9084c56d0999802917ac81
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, embedding numerous URLs that likely lead to malicious content or phishing sites. The presence of external URIs and the link farm heuristic strongly suggest an intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/aws?utm_term=actual+test+toeic+pdf PDF link annotation
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/jamowugesaduxuvo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368956/normal_5fce28ef88529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5fb34798835e8.pdfIn PDF document text
    • https://site-1246847.mozfiles.com/files/1246847/type_2_diabetes_diet_sheet.pdfIn PDF document text
    • https://site-1171373.mozfiles.com/files/1171373/59365888692.pdfIn PDF document text
    • https://putebofodabisig.weebly.com/uploads/1/3/4/3/134368176/3408516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428035/normal_5f9cdfae26f38.pdfIn PDF document text
    • https://zanasebumafuwaj.weebly.com/uploads/1/3/4/8/134899829/komumekozefevu-vidabupix-sekupivi-fepugixetaja.pdfIn PDF document text
    • https://site-1172901.mozfiles.com/files/1172901/77813251027.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/xakuvotofokejor-fugasaduxigagi-lipowa-keruxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383572/normal_5fa37935afe7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFF 5040 bytes
SHA-256: aee9d88477f95cb9b7f5ae37fb8e6d5ecc7da1731f35ab5048e80c8e5532686d
font_01_sfnt_off00012e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3E 10904 bytes
SHA-256: a0ad1346ae09715e728c48ced0b1686eb1b1ec237826e77f072cce2c7b19219b

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