Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec593cb78e1936d…

MALICIOUS

PDF

96.0 KB Created: 2020-04-14 01:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f5f5d3a2d65f3f57840940d3fbb36db7 SHA-1: cb3650145188e873750b8715029da7bca143e2e7 SHA-256: 6ec593cb78e1936dd4796dfecf1dd98889490a5f2118e7e35a3441bdf299287b
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or content distribution scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the sheer volume of linked PDFs is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://digitaldocmd.com/uploads/1/3/0/7/130775920/130775920.html#deconstruction+derrida+pdf
    • http://authorpreneurworkshops.org/uploads/1/3/0/9/130969129/govipid-fureru-zezuvobiva.pdf
    • http://navasotaminerals.com/uploads/1/3/1/1/131164399/jigumobatit.pdf
    • http://killmytv.com/uploads/1/3/1/3/131384335/ratubojotunufekabej.pdf
    • http://lillysslimery.com/uploads/1/3/0/3/130313190/190172.pdf
    • http://contadoreslobarnechea.com/uploads/1/3/0/7/130740502/nifulekifok.pdf
    • http://mypuriumsambi.com/uploads/1/3/0/7/130776212/7283856.pdf
    • http://askforhelptoday.com/uploads/1/3/0/6/130603916/jiwiruna-jubadite.pdf
    • http://speakeasyedc.com/uploads/1/3/0/6/130620327/591e0.pdf
    • http://g5gingenuity.com/uploads/1/3/0/6/130605357/busolakexusovi-fulagijepixarex-muxekarikofusop-makox.pdf
    • http://americancurlcatassociation.com/uploads/1/3/0/5/130543991/pidomefopu.pdf
    • http://owatonnaproud.com/uploads/1/3/0/7/130739007/womujakuz.pdf
    • http://hanbokworld.com/uploads/1/3/1/3/131398338/sagofumomuropuz.pdf
    • http://missusvicarious.com/uploads/1/3/0/5/130551309/nanigapin_bedejobixox.pdf
    • http://mimmiselect.com/uploads/1/3/1/4/131438759/a924ee2.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_off00015023.bin
c777c909f0bb807e02310648d76005fa668c0f7a44145685535ddf1c547bfa4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15023 9720 bytes