Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ffbd052a29c81db…

MALICIOUS

PDF

39.9 KB Created: 2020-04-05 04:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d838d1c244aaec2ac75ad4d718fa1df8 SHA-1: efa7ff0908594d90e4532e3443cf37a921de894b SHA-256: 0ffbd052a29c81db0c63216ae9825784533b48137c76c476fb609d1969284c1c
96 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier as malicious. It contains a large number of embedded external links pointing to various PDF files hosted on different domains. The document body text, while appearing to be a lure for romantic poems, is likely a cover for the link farm, which is a common technique for SEO manipulation or distributing malware. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://chaffhayenj.com/uploads/1/3/0/7/130775265/130775265.html#poemas+de+amor+cortos+para+mi+novia+aniversario
    • http://magnifascentproducts.com/uploads/1/3/0/7/130739664/c3f1cec5c2d7b.pdf
    • http://yolozwolle-lekkerpuh.nl/uploads/1/3/0/4/130483690/1015883.pdf
    • http://comfort-kids.org/uploads/1/3/0/6/130639209/lesigizovakoj_jesemedar.pdf
    • http://sse2011.graphene.org/uploads/1/3/0/2/130272421/8956134.pdf
    • http://carrouselmuseum.net/uploads/1/3/0/5/130539449/zulevoxe_rutakebavokuxu.pdf
    • http://australianshepherd-iceland.net/uploads/1/3/0/2/130272344/zapesiromapuget.pdf
    • http://renegades-elite.com/uploads/1/3/0/4/130489776/9408316.pdf
    • http://realtexaswine.com/uploads/1/3/0/5/130543333/4d6534.pdf
    • http://bluedangergaming.com/uploads/1/3/0/2/130271063/wifudinutif-suxadodatoda-gitamew.pdf
    • http://brintala.com/uploads/1/3/0/4/130483649/96cc5cdd41a31.pdf
    • http://canoncitypets.com/uploads/1/3/0/6/130620296/zowijozanuxusir-gikojogupunuvo.pdf
    • http://epiphanyweddingsandevents.net/uploads/1/3/0/7/130776246/1070424.pdf
    • http://colourfulsunshine.com/uploads/1/3/0/3/130379581/bekesol-vosimozugo.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ee8.bin
a0599087e20a54584541b75576c7eab0f78ecc2980a7ba44c87806282bcab8ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE8 9392 bytes

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