Malicious PDF — malware analysis report

Static analysis result for SHA-256 613c2f90f2aeb2e9…

MALICIOUS

PDF

30.9 KB Created: 2020-05-15 07:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ad4fef950fc36fb213ec8e712195981 SHA-1: a2d4faed47b0ffb25a5361fec822eb12943547bc SHA-256: 613c2f90f2aeb2e96a8dfab36641cdfcd8bfb18281362660cc5c08bc4c9056bd
116 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which appear to be part of a link farm designed to improve search engine rankings. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, consistent with a tech-support or payment scam. While no scripts were directly extracted, the ML classifier strongly suggests malicious intent, and the presence of many external URLs points towards a phishing or scamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://divinebydesigneventplans.com/uploads/1/3/0/4/130488661/130488661.html#attending+provider+treatment+plan+form+nj
    • http://moosewoodalaska.com/uploads/1/3/0/6/130604102/jizemopakar.pdf
    • http://specialeventsmusicut.com/uploads/1/3/1/1/131164564/7516201.pdf
    • http://letstourindia.net/uploads/1/3/0/5/130539691/2886784.pdf
    • http://racearoundslovenia.com/uploads/1/3/0/5/130539223/weladu.pdf
    • http://rockymountainpropertyservice.com/uploads/1/3/0/5/130589429/5443453.pdf
    • http://equinediagnostic.com/uploads/1/3/0/2/130289760/6c8bc8795.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_off00004ce5.bin
a0c267c77605d2e9dcc36e6c51314dd93c1736677d7ca5b816fe0b4a15bea4ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CE5 10780 bytes

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