Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d4ef19940fc55a…

MALICIOUS

PDF

33.5 KB Created: 2020-05-16 04:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea89dff7098f2fef25efb1969961366e SHA-1: 0d70e033f50c5324ca691a74aee756f95a7c5bc5 SHA-256: d9d4ef19940fc55a45b59603957e455d5ef13af48d900e0ef02c497735865bfd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This pattern is indicative of a link farm or SEO spam campaign, likely intended to drive traffic or host malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://edgelandscapeandmaintenance.com/uploads/1/3/0/2/130288002/130288002.html#sql+server+for+xml+path+date+format
    • http://manbitesboat.com/uploads/1/3/0/7/130776272/padatewar_kasejijixexevi.pdf
    • http://chubbycheetah.com/uploads/1/3/1/4/131438316/vulemezizifafor-xavilimutine-vixiwavokubolov.pdf
    • http://pcofirm.com/uploads/1/3/0/3/130323417/nonawumumoxarezemuj.pdf
    • http://arrowsteam.org/uploads/1/3/0/4/130491594/paxifafopusezuk.pdf
    • http://sciotovalleyinsurance.com/uploads/1/3/1/4/131483235/996ee67a0b21.pdf
    • http://paintedpallet.icu/uploads/1/3/0/9/130969254/mobezowexazepu_zuminezesa_dofebinuza_gamagowed.pdf
    • http://limpiezaaguila.com/uploads/1/3/1/4/131437138/1e651d.pdf
    • http://feedourneighbors.com/uploads/1/3/0/6/130621754/38477bbe.pdf
    • http://roanokeaa.com/uploads/1/3/0/8/130815093/c88bec5d.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_off00005715.bin
66bfd5567d3f11f2c6da4b3eaababb2121d51f20c3c681b147eba257d4a55c70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5715 10732 bytes

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