Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c7ef96bd6d422d…

MALICIOUS

PDF

32.7 KB Created: 2020-04-09 19:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b4e08fbced0e7abb33dbd25e0d396601 SHA-1: 71bc510dba46e0107044d9369f64bbed0303da7d SHA-256: 86c7ef96bd6d422d229a938703706e18c90e8b242fb9688210041867911ded6d
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with multiple external URLs, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_RANDOM_URL_LINK heuristic further supports the suspicious nature of the embedded links. No scripts were extracted, limiting the analysis of direct execution capabilities.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://garagedoorrepairlacanadaflintridgeca.com/uploads/1/3/0/4/130488839/130488839.html#e%C4%9Fitim+psikolojisi+kpss+%C3%A7%C4%B1km%C4%B1%C5%9F+sorular
    • http://greenscapeventures.com/uploads/1/3/0/8/130813982/tixegenorafet.pdf
    • http://thefadeschool.com/uploads/1/3/0/6/130621703/jizemage-sediwipifena-zodawerefe.pdf
    • http://almostprohockey.ca/uploads/1/3/0/3/130313582/7746543.pdf
    • http://prosidera.net/uploads/1/3/0/6/130621890/fumagidawom.pdf
    • http://tootsietrendsboutique.com/uploads/1/3/0/4/130476688/40c74.pdf
    • http://heartbeatboxingclub.com/uploads/1/3/1/1/131163962/xasiparenaz-falasusumipopo.pdf
    • http://goldenphoenixwest.net/uploads/1/3/0/5/130540097/domitopib-rigox-lerunav.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_off00004f87.bin
e202ddc75f2b6e53f24846c405f80e918443066a820bfb3de693ed57cd9c4674		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F87 10552 bytes

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