Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de84e76ff38027c…

MALICIOUS

PDF

39.9 KB Created: 2020-11-07 01:08:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 943c36f2591eb8ed3529eeab39834cef SHA-1: 9c1acefc1872fd59906abc492032ad78d20c5658 SHA-256: 3de84e76ff38027ca77df1dad675e31745e735bd48d0f6132aec78fa4f313466
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable or low-reputation domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, likely as part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://traffnew.ru/aws?keyword=pengling+animal+image PDF link annotation
    • https://zavebunerug.weebly.com/uploads/1/3/4/3/134358754/5261449.pdfIn PDF document text
    • https://sabopedawexidix.weebly.com/uploads/1/3/4/3/134305122/dakugizis_kajawafawolu_veregifef_jokaletaled.pdfIn PDF document text
    • https://balijuwil.weebly.com/uploads/1/3/4/4/134403438/d6c8e5b25.pdfIn PDF document text
    • https://zinikedefi.weebly.com/uploads/1/3/0/7/130740178/vosimu-redibelefavepu-nufid-tixugikigupiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tuxabavijig.files.wordpress.com/2020/11/37940387668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0da8bda-57eb-4993-b060-0ff377dbf53e/posie_grenouille_de_raymond_queneau.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/reremuradivuvevedivogobid.pdfIn PDF document text
    • https://gigevuko.files.wordpress.com/2020/11/1554592316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/377654bd-5071-4b0a-b9e1-5d2264250582/4303305185.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/vekikexagexeworemap.pdfIn PDF document text
    • https://fexodup.files.wordpress.com/2020/11/deriloxilur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d36def-0425-4cd8-be8c-df3c3ad5166b/63085289821.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/57057903089.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_off00005f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F68 4732 bytes
SHA-256: 455374732109e289ce99f92860c2ee7489aa288717e8ff430bae08d507a70400
font_01_sfnt_off00006f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F73 10572 bytes
SHA-256: 09311aae994a5771b1ff36202af8839d1142187fea2f50ccee28b2ac0b58feab

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