Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b67d2afd0ee7ba…

MALICIOUS

PDF

38.8 KB Created: 2020-04-09 05:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2aeb6678794b4dd75ac8885aa108f6f9 SHA-1: 9374d0e7cb5384c07b967b4aa37e0d4f89275c94 SHA-256: c2b67d2afd0ee7ba1710ec7758251126a63ab4e33dd3dfa381eaa3340d6ada19
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains references to 'Va form 21-526ez mar 2018', suggesting a lure related to official forms. The primary attack pattern involves directing users to a multitude of external PDF files hosted on various domains, likely for SEO spam or to distribute further malicious content. No scripts were extracted, limiting the analysis of direct payload execution.

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://mannhandled.com/uploads/1/3/0/6/130604342/130604342.html#va+form+21-526ez+mar+2018
    • http://cristofirbradleycabinetry.com/uploads/1/3/0/7/130775665/rimirifixirixigenuf.pdf
    • http://rollwithalex.net/uploads/1/3/0/6/130603847/84d32.pdf
    • http://anniekingharp.com/uploads/1/3/0/5/130551267/970731fee8.pdf
    • http://americathebeautifulandviolent.com/uploads/1/3/1/1/131164322/pezipobadopusupixu.pdf
    • http://tamikabailey.com/uploads/1/3/0/6/130620662/60a4f1f02be9a5.pdf
    • http://neotribes.org/uploads/1/3/1/4/131406688/9689a33f46ec9.pdf
    • http://eaglecreekselfstorage.com/uploads/1/3/0/4/130483546/3036051.pdf
    • http://ogradycommunications.com/uploads/1/3/0/6/130640209/niware-lizujuf-bepolusuja.pdf
    • http://dalybrand.com/uploads/1/3/0/6/130620293/2416879.pdf
    • http://venuswisdomschool.com/uploads/1/3/0/4/130488615/jakipikalofoxidu.pdf
    • http://morph-bcs.com/uploads/1/3/1/3/131383247/8e7b11bfbb.pdf
    • http://shashvatfoundation.org/uploads/1/3/0/5/130539297/rebit.pdf
    • http://modernsteps.net/uploads/1/3/0/3/130379117/fixewakotaxaj.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_off00006f36.bin
c6e998683a4d0b06f2bfde2f23c4c37113b9f8e26c4b41de1b8b87a3e100c7f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F36 8076 bytes

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