Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7c2f3042bb9fab…

MALICIOUS

PDF

106.3 KB Created: 2020-04-19 07:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d8b6a4a4150c720036ece43b56237779 SHA-1: 2aec3f89a35c1c8cd696685df6287d7d3c6cab4d SHA-256: 0c7c2f3042bb9fabffafbff7c6b05cffadf008ec4d41a63d5b9a9407d1330ac1
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The 'SE_MFA_LURE' heuristic indicates the document is designed to harvest credentials or MFA codes. The embedded URLs likely lead to phishing pages or further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://ruszkowski.info/uploads/1/3/0/5/130589251/130589251.html#agile+methodology+in+testing+pdf
    • http://theshrimpzoo.com/uploads/1/3/1/3/131380589/f555515.pdf
    • http://beautifulpinkk.com/uploads/1/3/0/9/130968957/kosidarututab-kamiguxipu-dawujupozufori-jetavotulixevub.pdf
    • http://24-7-365mobilenotarialservice.com/uploads/1/3/0/9/130969511/9728320b9962657.pdf
    • http://thegoodenoughfarm.com/uploads/1/3/0/7/130776105/eca330b280e2.pdf
    • http://kandiddesign.com/uploads/1/3/0/3/130379132/remala.pdf
    • http://centraliacornerstoneumc.net/uploads/1/3/0/6/130620956/1aa0f789ec48bf.pdf
    • http://fignacy.com/uploads/1/3/0/6/130640015/vozofigu.pdf
    • http://ramalocala.com/uploads/1/3/1/4/131438766/nakuwuxapak-derujukinep-punew.pdf
    • http://props-gewichtsdecke.com/uploads/1/3/0/6/130639468/4790887.pdf
    • http://dukehomeinspectionservices.com/uploads/1/3/1/4/131407068/mapiboju.pdf
    • http://caddycapdesigns.com/uploads/1/3/0/7/130740450/borokagasubale.pdf
    • http://thslsfaexchange.com/uploads/1/3/0/8/130814858/juxolulu.pdf
    • http://bernbus.org/uploads/1/3/0/7/130739211/wavetefuner_gazodoxitadavib_gilaso.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_off00017ab4.bin
c3274bc19c28b18fef1fc606f4a9e952757db8ce2bae584a659bb2ea53fbfcc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17AB4 8900 bytes

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