Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2becf958d9a2e3…

MALICIOUS

PDF

31.3 KB Created: 2020-03-11 07:19:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e5ba8eadb3a5d8e23bf191383e68ff5c SHA-1: 967ba4a84a796cf03198753d80a137053d1c7ec0 SHA-256: 9c2becf958d9a2e32adea3e8b86d229cfa1760c0b605d39b5756084a8865c74c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to unrelated content, indicating a link farm or SEO poisoning tactic. The document body, though partially corrupted, contains text related to 'air pressure relief valve' and the wkhtmltopdf generator, suggesting a lure to disguise the malicious intent. The primary goal appears to be directing users to potentially malicious external websites, as evidenced by the numerous unknown-reputation URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://74-123-78-29.mgwnet.com/uploads/1/3/0/6/130620798/130620798.html#air+pressure+relief+valve+adjustable
    • http://breakthroughbroadcasting.com/uploads/1/3/0/9/130969204/kajuduvil_nobew_fobero_nopimotaximizu.pdf
    • http://www.docelu.jezus.pl/uploads/1/3/0/7/130776104/0e9a5d.pdf
    • http://www.juniorhigh.ch/uploads/1/3/0/6/130639133/tazixulozusejawabeb.pdf
    • http://mancavemonday.com/uploads/1/3/0/6/130622084/kafosuzozif-jixurajugit-tofeturelatil-narogupav.pdf
    • http://inquiry-based.com/uploads/1/3/0/8/130873937/jaxunebaxefizu.pdf
    • http://apartmentlocatorshomefinding.com/uploads/1/3/1/0/131070402/lekulivezobetakaxu.pdf
    • http://goatplatform.com/uploads/1/3/0/7/130776433/rulev_mitomafubus_vegudij.pdf
    • http://mycokosmos.org/uploads/1/3/0/2/130289754/2d2fe039.pdf
    • http://hinnerschietzinsurance.com/uploads/1/3/0/2/130270808/bikovug_kirelerevunemub.pdf
    • http://hirejosie.com/uploads/1/3/0/5/130539229/efe093279bb0.pdf
    • http://midiklorians.com/uploads/1/3/0/4/130483386/rizarolevoka_bofudo_majejavepan.pdf
    • http://www.fattbellybbq.com/uploads/1/3/0/3/130324227/vavosaputo-sonebaxu.pdf
    • http://thefamilyfunband.com/uploads/1/3/0/4/130436137/muxasi-tetemadibewom-zifapep.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_off00005488.bin
b9284396187772030f5bebeb628262bf3444fcebc87d012bdc56fd170d615d00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5488 6988 bytes

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