Malicious PDF — malware analysis report

Static analysis result for SHA-256 654b03fd374ea323…

MALICIOUS

PDF

43.2 KB Created: 2020-05-15 06:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dacf293fcb9107858a117c084b7cdbe3 SHA-1: 18ed1a64ddd7e2a6dc9bcdf3662f78a8839487fc SHA-256: 654b03fd374ea323a175cff44748e48cdaad220135542c5aac5a651a64fa9a53
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely intended to lead users to malicious content or phishing pages. The primary attack pattern involves directing users to a vast network of linked PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://apexacorp.net/uploads/1/3/1/3/131380934/131380934.html#amrapali+songs+ming
    • http://esgeneralconstruction.com/uploads/1/3/1/0/131071288/e83031e1.pdf
    • http://bridalbeautyteamvegas.com/uploads/1/3/0/3/130313140/2128541.pdf
    • http://syndicatestreetstore.com/uploads/1/3/0/6/130621331/taxutavolemeno.pdf
    • http://wisdomforthevision.com/uploads/1/3/0/4/130435594/d9463a.pdf
    • http://skyryanska.com/uploads/1/3/0/6/130639418/2344210.pdf
    • http://derekstestpage.com/uploads/1/3/0/5/130543154/72f604c190606b.pdf
    • http://researchtracked.com/uploads/1/3/0/6/130621362/da6b8342561.pdf
    • http://readthinkwritespeak.com/uploads/1/3/1/6/131606305/f9846a197.pdf
    • http://dalcomme.com/uploads/1/3/1/8/131871405/18760c7bd949.pdf
    • http://how2hockey.net/uploads/1/3/0/7/130739251/zotibezututi.pdf
    • http://layeshawalton.com/uploads/1/3/0/2/130289430/kimata.pdf
    • http://wangwa-ltd.com/uploads/1/3/1/4/131453577/kiwazekolu_wuxuverat_bapajanu_nirixuxotus.pdf
    • http://myreflectionjournel.com/uploads/1/3/0/5/130589070/nipemekalulebas.pdf
    • http://woodwax.net/uploads/1/3/0/6/130603834/jebafofofodale-vatosalugapotit.pdf
    • http://sunshine4sumner11.com/uploads/1/3/1/3/131379554/jakesudeliduked.pdf
    • http://sylccforclimate.com/uploads/1/3/0/2/130287279/sanutav_voparezojig_wogadugusuj.pdf
    • http://wattingen.nl/uploads/1/3/1/3/131379033/2888197.pdf
    • http://fablala.com/uploads/1/3/1/3/131383823/3773f39c66f94.pdf
    • 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_off00007128.bin
9e0c66c4f22437dd39f206fc9fb15491b13f3278b059e65de547d8c11b5b6d44
pdf-font-stream PDF embedded font (sfnt) at offset 0x7128 3456 bytes
font_01_sfnt_off00007d72.bin
eb3cec4ceb9cde2f9c49d668fc61df61ffd6179f621020cd61f006edcda249a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D72 10516 bytes