Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e604e1c241b4e61…

MALICIOUS

PDF

37.8 KB Created: 2020-06-23 14:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1109dd7dc5828afd66a586b923de891 SHA-1: 9216493aa9e0ea946a9baecc7c497c49d6869a59 SHA-256: 7e604e1c241b4e61f88b22c545ef4d48de58201197c6e9892d1c9e6972c5bfa6
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files with numeric slugs, suggesting a link farm or SEO spam operation. The document body, though partially obfuscated, contains a URL that leads to a similar structure. The presence of numerous external links and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to potentially harmful websites or to manipulate search engine rankings.

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://ridgidfitness.com/uploads/1/3/0/2/130289310/130289310.html#places+to+take+horse+riding+lessons
    • http://jnsbuildingandcivils.com/uploads/1/3/0/3/130313064/pekixagewipigore.pdf
    • http://vinechurchoftampabay.org/uploads/1/3/0/6/130605048/welejevaza.pdf
    • http://skyesthelimit.blog/uploads/1/3/0/2/130289218/8149144.pdf
    • http://webdisk.strangebedfellas.com/uploads/1/3/0/5/130550826/d9420dec7a8.pdf
    • http://mta-sts.lacrescentareaeventcenter.org/uploads/1/3/0/5/130540788/xokokazuxod.pdf
    • http://jnaconstruction.biz/uploads/1/3/0/2/130291971/5d02f.pdf
    • http://mail.fatherjim.com/uploads/1/3/0/8/130874629/50f821448a331c.pdf
    • http://patchchemicals.com/uploads/1/3/0/5/130541743/divovaxisavomuw.pdf
    • http://johndodsonmassage.com/uploads/1/3/0/4/130435763/4942572.pdf
    • http://lra.org/uploads/1/2/9/4/129455080/129455080.html?vintage
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005550.bin
9723ee894c30a15aadbb1296ca25bd8f0e6f2ef57790343a9b186c1e15a26483		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5550 5052 bytes
font_01_sfnt_off00006664.bin
38f5ff4e2f9aa24e4bd6442cb3a608d181c1cd9f3155006acc59ab54be2ae998		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6664 10840 bytes

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