Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ec3d2589aa8bc7…

MALICIOUS

PDF

33.3 KB Created: 2020-06-16 06:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 965b173470a9c274ebc0859931e88a5d SHA-1: 3c1128a23f3fe146a76f0bf995f7c9d671df81cc SHA-256: 05ec3d2589aa8bc7de7e34aacb306e9ec0b6af5e229f8400a79e31c719646245
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of numerous PDF_SEO_LINK_FARM heuristics supports this. While no scripts were explicitly extracted, the embedded links themselves are the primary indicators of malicious intent, likely serving as lures to phishing or malware distribution sites.

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://74-123-73-201.mgwnet.com/uploads/1/3/2/3/132303134/132303134.html#1997+acura+rl+repair+manual
    • http://hightensionhemp.com/uploads/1/3/0/3/130323632/mewatekixenorep.pdf
    • http://absorbing.peteandlauren.com/uploads/1/3/1/0/131069738/vaxuruxupaweretegi.pdf
    • http://soluzionielettroniche.net/uploads/1/3/1/1/131163687/a4412e39c21858b.pdf
    • http://aviatorassetmanagement.com/uploads/1/3/0/2/130289198/8039363.pdf
    • http://balancedelevations.com/uploads/1/3/0/5/130541641/tadasite.pdf
    • http://autodiscover.therockathleticsptc.com/uploads/1/3/0/6/130639599/butubukejozemefovoni.pdf
    • http://sys.histomedical.com/uploads/1/3/0/4/130476143/rinebubuvujof.pdf
    • http://cpanel.ashleymartinportfolio.com/uploads/1/3/0/6/130621720/vizakitukanolo.pdf
    • http://mx.recycledbrick.com/uploads/1/3/1/3/131383864/sexov-pikemaluka-mololigil.pdf
    • http://modificafacil.com/uploads/1/3/1/4/131454126/7542435.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off000055bd.bin
92a5be7c5900602b5765c4ee1e961c92d5b19d25e2c9931435f27afa5b2299cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55BD 11320 bytes

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