Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ddfd11363e9840…

MALICIOUS

PDF

139.9 KB Created: 2020-04-19 00:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6939dce09b89da6745beb9cbb84875da SHA-1: 28b3c4dcba47bbd6244992de4641e58ece24ecd1 SHA-256: 72ddfd11363e98401749e940e16e991d345f30731a235fd42ab414fa4e51dbc9
116 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are dynamically generated and point to other PDF files, suggesting a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. The presence of numerous external links and the ML classifier's high confidence score indicate malicious intent, likely to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://synarboras.com/uploads/1/3/0/4/130478868/130478868.html#turbojet+engine+report+pdf
    • http://juanodeonphotography.com/uploads/1/3/0/7/130775186/soturezesowe.pdf
    • http://depilatsioonmeestele.ee/uploads/1/3/0/7/130740450/8947433.pdf
    • http://southburycremation.com/uploads/1/3/0/7/130739143/soserijesibize-sozimizidiwu-pazezenojatojo-nidikokalu.pdf
    • http://herkyphotography.com/uploads/1/3/1/4/131406558/boxonolipara-nelek-panaso.pdf
    • http://ideationenergy.com/uploads/1/3/0/6/130639409/490359.pdf
    • http://abcrmc.net/uploads/1/3/0/6/130621587/1319479.pdf
    • http://wheelchairfriendlycottages.com/uploads/1/3/0/5/130541327/fuweperademap-lufak.pdf
    • http://dmholistictherapy.com/uploads/1/3/0/3/130379561/6837362.pdf
    • http://justdashuri.com/uploads/1/3/0/5/130539446/lagakebumiz.pdf
    • http://saraleestudiogallery.com/uploads/1/3/1/0/131070754/5687068.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e66e.bin
676bb9dd10c81fbd35430f9823731fae4afaecab24118b90519bab849a588e66
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E66E 9192 bytes
font_01_sfnt_off00020003.bin
9108f255b39c2b8dfd7372e5b40186cb3f9b43e3c609d3cfbaac82320bd7c57a
pdf-font-stream PDF embedded font (sfnt) at offset 0x20003 9124 bytes