Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb3ef60dbc1dba4…

MALICIOUS

PDF

141.1 KB Created: 2020-04-15 02:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f1667bc8d426664dbd6ee8abb6a48bcb SHA-1: 1c97152406a772c4242ed54671b73844ea5079b2 SHA-256: eeb3ef60dbc1dba439abd205e1642eec96bab0b2da49dc9734541a292af852d4
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is indicative of a link farm attack pattern.

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://dvega2daltonstate.com/uploads/1/3/0/6/130639854/130639854.html#cabergolina+bula+pdf
    • http://annarborcleaningco.com/uploads/1/3/0/6/130640191/3807831.pdf
    • http://wendys-designs.com/uploads/1/3/0/5/130551524/df9483ee22367.pdf
    • http://fourcornersfibercollective.org/uploads/1/3/1/3/131379168/dolofoxab.pdf
    • http://cvaccreditation.com/uploads/1/3/0/2/130273576/5957820.pdf
    • http://rachaelfulk.com/uploads/1/3/0/5/130589283/rawipoku_levajidaxove_wufivuta.pdf
    • http://mgcoaching.net/uploads/1/3/0/3/130313755/gikelefisediwol-lumezexu-lesovalifejazok.pdf
    • http://richestornament.com/uploads/1/3/1/4/131453544/gilexopiweri.pdf
    • http://amarefinds.co/uploads/1/3/0/6/130620620/jokil-nosutosagumofi-voderiwu.pdf
    • http://therockoutz.com/uploads/1/3/0/7/130776102/zojegizi_xozuxukuxotes.pdf
    • http://odsvirginhaircollection.com/uploads/1/3/0/8/130873965/kulizodovel.pdf
    • http://oliviadummer.com/uploads/1/3/0/7/130775393/3762343.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_off0002050e.bin
cd7f323568f79dbb223a93a6282dc52936693a3ee54a571df0550b4720a94c10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2050E 9400 bytes

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