Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a8e2fd1f8d0c4b…

MALICIOUS

PDF

31.8 KB Created: 2020-05-08 18:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f77a2fdef1adf9410bddef05c42c9251 SHA-1: e7c10a64dec95f1e674f2e5f3c284f50d362a6a4 SHA-256: f6a8e2fd1f8d0c4b528ceea341853a0039f0e76902cd5746fa313f40a06be2fa
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are also present in the extracted URL list. The primary attack pattern involves directing users to a multitude of external sites, likely to host further malicious content or for SEO spam.

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://tieroneinspection.org/uploads/1/3/1/6/131637104/131637104.html#the+poseidon+adventure+2005
    • http://sbuildersinc.org/uploads/1/3/0/4/130435652/ed0514dd.pdf
    • http://blueheronscientific.org/uploads/1/3/0/7/130740342/supelakok_novamifapotav_rigeri.pdf
    • http://davisenergymedicine.com/uploads/1/3/0/4/130477170/260588.pdf
    • http://treeservicerockhillsc.com/uploads/1/3/1/6/131607023/8090384.pdf
    • http://harvestcityworship.com/uploads/1/3/1/3/131398324/22f68062e4.pdf
    • http://sandiegorealestateconcierge.com/uploads/1/3/0/5/130543377/tonidi_boputafezid_nunesubopejut.pdf
    • http://dnicholeking.com/uploads/1/3/1/0/131070115/2932905.pdf
    • http://holisticpaths.org/uploads/1/3/0/4/130483136/afb69.pdf
    • http://shopcode58.com/uploads/1/3/1/0/131070993/9257820.pdf
    • http://diamondbellranch.com/uploads/1/3/0/6/130605206/8751898.pdf
    • http://darrenhudson.me/uploads/1/3/0/4/130476541/7246201.pdf
    • http://southwest-led.com/uploads/1/3/0/5/130588270/7181713.pdf
    • http://therealdavidchoi.com/uploads/1/3/0/4/130435745/tubopumoseduli.pdf
    • http://emmabdigital.ie/uploads/1/3/1/6/131606134/maruwuxupisumoluv.pdf
    • http://wingsofhealing.global/uploads/1/3/0/6/130639121/xajamexewugowana.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00005108.bin
f798609670a8646a1b57087ece84343241729469b9f45882b96a9d1eaf1b2ae0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5108 10532 bytes

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