Malicious PDF — malware analysis report

Static analysis result for SHA-256 7151d1a168e875dc…

MALICIOUS

PDF

31.4 KB Created: 2020-06-13 01:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d024b7301055e3fc2f19c0a0f9c6ca37 SHA-1: 062b9deaec56e1df03992fbd6ec2065254f2f3b4 SHA-256: 7151d1a168e875dc9a5e274b0771525d03f92a16684d83a7951c086c5d606090
96 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious and contains a large number of external links, indicating a potential SEO spam or content hosting lure. The embedded URLs, such as http://admin.hwupenyuproject.org/uploads/1/3/0/6/130639784/130639784.html#dragon+ball+season+1+ep+1+dailymotion, suggest an attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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 http://admin.hwupenyuproject.org/uploads/1/3/0/6/130639784/130639784.html#dragon+ball+season+1+ep+1+dailymotion
    • http://bimedical.net/uploads/1/3/0/6/130620979/kuxubuxago.pdf
    • http://kittycandle.com/uploads/1/3/1/4/131406288/42f3ba095.pdf
    • http://rcintegrations.com/uploads/1/3/0/4/130483210/0fc6208d4697e08.pdf
    • http://portal.afgbrokerage.com/uploads/1/3/0/5/130539139/164e8ed3f3d62.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://farunowe.files.wordpress.com/2020/06/5919475241.pdf
    • https://movovosu418811970.files.wordpress.com/2020/06/13582055197.pdf
    • https://kemujemurer.files.wordpress.com/2020/06/77798631030.pdf
    • https://gofifod.files.wordpress.com/2020/06/76862695578.pdf
    • https://sabuninovaju.files.wordpress.com/2020/06/zefokexabesolelojomabuki.pdf
    • https://dojujakukaj.files.wordpress.com/2020/06/wuvekukamivelata.pdf
    • https://sufajase.files.wordpress.com/2020/06/90537320502.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000537c.bin
e8e60a95dc154c17ccc97bd718e7a2ac6883fe038fca30290bf4ea8d48048ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x537C 9276 bytes

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