Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7103c9a1d3c1c59…

MALICIOUS

PDF

53.9 KB Created: 2020-04-10 17:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e28c40ea39cc8f1af934810b77f277c0 SHA-1: 457a598916bed99d1a258510665e968cc26f738c SHA-256: b7103c9a1d3c1c594eea7475dbd0c056b6e4c8496e39b0e025cd5e822331e606
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links pointing to various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains a URL that matches one of the extracted links. This suggests the primary purpose is to redirect users to a network of linked PDF files, likely for SEO spam or to distribute further malicious content. No scripts were extracted, limiting the analysis of direct payload execution.

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://path2drinks.com/uploads/1/3/0/2/130270897/130270897.html#como+hacer+subnetting+vlsm
    • http://pacifictreecare.info/uploads/1/3/0/5/130588613/zivizif.pdf
    • http://mylooc.eu/uploads/1/3/0/5/130550693/0fd4d78a6.pdf
    • http://teul.eu/uploads/1/3/0/7/130776509/tazaxogi.pdf
    • http://ginslovmediastudio.com/uploads/1/3/0/5/130550774/2191048.pdf
    • http://atoozbiz.com/uploads/1/3/1/3/131384778/fegejol.pdf
    • http://ecoreflection.info/uploads/1/3/1/0/131070230/837887.pdf
    • http://executiveconsultingservicesltd.com/uploads/1/3/0/5/130590208/manolada.pdf
    • http://summitwineandspirits.com/uploads/1/3/0/2/130288924/805610.pdf
    • http://channelswimnutrition.com/uploads/1/3/0/6/130605108/1014516.pdf
    • http://mitchhosford.com/uploads/1/3/0/8/130813553/vikufumesemewibel.pdf
    • http://bri-bakingandcatering.com/uploads/1/3/0/5/130540477/39cf8ab47.pdf
    • http://piecewhys.com/uploads/1/3/0/5/130590339/nunaz-pokugi.pdf
    • http://acadiantax.com/uploads/1/3/1/6/131606434/jerulepifegedi_vusedewipab.pdf
    • http://morgane-claudine-laurent.com/uploads/1/3/0/5/130550750/9781006.pdf
    • http://williamyasnoff.com/uploads/1/3/1/3/131379085/xejomepewudor.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_off0000aa51.bin
1777de3125bbf8b7b788fdd0f9405721b7ec8f71ee7a4207853ffea2148bc0e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA51 8840 bytes

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