Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf6806625313a76…

MALICIOUS

PDF

43.6 KB Created: 2020-03-06 16:13:06 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b931257dab2814790a122de3f3f19d57 SHA-1: acdc1dc06835fc24786e81545dc5c04f2cf139db SHA-256: 6cf6806625313a766c1070f064c41f765a5f7c4c2692f419d1db99bd0d1a4b81
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body text, though partially obfuscated, includes a reference to 'Fedex international air waybill no' and a URL that appears to be a lure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or distributing further malware. No scripts were extracted, but the sheer volume of external links suggests a link farm or redirection mechanism.

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://douniuniuwanfa.br3h.com/uploads/1/3/0/4/130476573/130476573.html#fedex+international+air+waybill+no
    • http://sassysquatch.com/uploads/1/3/0/4/130477287/wisesirudus-wedet.pdf
    • http://stillwaterfiretower.com/uploads/1/3/0/4/130476135/sutukaroz.pdf
    • http://asylumofbrokendolls.com/uploads/1/3/0/7/130739927/a92a99.pdf
    • http://transcreationlab.com/uploads/1/3/0/6/130603809/fivasezero.pdf
    • http://osmosistours.com/uploads/1/3/0/4/130477083/dofonawi_gowanozapunewuj_turabazekarowot.pdf
    • http://stageflow.net/uploads/1/3/0/3/130313398/turoganilizawoz_vivalavutuwuzu.pdf
    • http://barifine.com/uploads/1/3/0/5/130588769/xarevod.pdf
    • http://www.northcitycoc.org/uploads/1/3/0/4/130490915/lijokukuniwike_wekolesa_xalebaweg.pdf
    • http://newyearsknockout.com/uploads/1/3/0/5/130589998/de1213c96634205.pdf
    • http://thingsome.com/uploads/1/3/0/6/130639855/eb50617ee93.pdf
    • http://thefountainofjoy.org/uploads/1/3/0/4/130494871/fafigotiba.pdf
    • http://qlfirewall.com/uploads/1/3/0/6/130639935/623094.pdf
    • http://charlesadavenport.com/uploads/1/3/1/0/131070381/1027537.pdf
    • http://hostmaster.wbdesign.info/uploads/1/3/0/7/130738939/xuxabebubofodala.pdf
    • http://webmail.yungthach.com/uploads/1/3/1/0/131071037/6405181.pdf
    • http://iphonegamerguide.com/uploads/1/3/0/5/130547613/bisoxunepopuj.pdf
    • http://hostmaster.jacmacdesigns.co.uk/uploads/1/3/0/5/130550770/zukusipapu-gozonuda.pdf
    • http://canberry.net/uploads/1/3/0/7/130774979/c2202fce8f9e.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_off00007f61.bin
7aed01824959f2bb56517bf48e49d12d43d668b7490094c3caf59d13293b29fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F61 8704 bytes

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