Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0ff48e76e1161f…

MALICIOUS

PDF

36.8 KB Created: 2020-04-09 13:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a477f08e3478486b39d63b3651a98155 SHA-1: 4ba18d315c7d70c4e8009d73c787de1ee64750a5 SHA-256: 6f0ff48e76e1161ff9f0a5b422c6c60a4214292feab1d628a31cf5d7972c746a
116 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external PDF files, a technique often used for SEO manipulation or to host malicious content. The ML classifier strongly indicated maliciousness, and the presence of many external links suggests a link farm or a distribution mechanism for further payloads. Although no scripts were directly extracted, the structure and heuristics point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://prettypuppystudios.com/uploads/1/3/0/6/130620700/130620700.html#utah+rules+civil+procedure+5
    • http://macedoniasoulwinningchurch.org/uploads/1/3/1/4/131452981/0e591bf728741.pdf
    • http://usahaulers.com/uploads/1/3/0/7/130739970/4105017.pdf
    • http://soldonmike.com/uploads/1/3/1/3/131380297/rirolavanimuri-nukupu.pdf
    • http://bigjs.net/uploads/1/3/0/7/130738675/4818669.pdf
    • http://yecmonty.com/uploads/1/3/0/2/130289270/nolobe_kidewonusive_jojekozuvateke.pdf
    • http://edenliterary.com/uploads/1/3/0/2/130273980/a57734d23a77.pdf
    • http://rachandrollfoundation.com/uploads/1/3/1/3/131384232/9995214.pdf
    • http://abnyg�rdsvej.dk/uploads/1/3/1/4/131406962/6259063.pdf
    • http://smartwood.us/uploads/1/3/0/7/130740483/lewunifolojub-moberefebepaz.pdf
    • http://berriencountyrighttolifemi.com/uploads/1/3/0/6/130603861/3740617.pdf
    • http://myenvisionphotography.com/uploads/1/3/0/3/130313400/vowukuxidovukadum.pdf
    • http://zacktucker.com/uploads/1/3/0/8/130813651/9610704.pdf
    • http://eastlakebuilders.com/uploads/1/3/0/4/130435914/eaf9a92f.pdf
    • http://xn--abnygrdsvej-18a.dk/uploads/1/3/1/4/131406962/6259063.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_off00006a1a.bin
5d48c8f6843f731404dba7d96680dfb5f30a1e1d036e2c391dad0692d7ea446a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1A 7172 bytes

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