Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3dbbd724776dc94…

MALICIOUS

PDF

57.0 KB Created: 2020-03-09 04:15:36 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f4110978e7c18bfa8e8f9d9dfeb7c7e1 SHA-1: 9f9ee48ca0472720007dc82a07c58479ee00fd77 SHA-256: f3dbbd724776dc94e0277901b9f42386c9cbf6655b942db6c3646d1155e730b4
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm. The primary URL points to an HTML file, while many others point to PDF files hosted on various domains. This suggests a tactic to manipulate search engine results or to distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://wcd-z3r6fe.mgh-r.ch/uploads/1/3/0/4/130483551/130483551.html#nmda+antibody+encephalitis+mri
    • http://paulaweeksinternational.com/uploads/1/3/0/6/130604581/1389436.pdf
    • http://www.redefineworthy.com/uploads/1/3/0/8/130814575/zewudekijolepo.pdf
    • http://www.navarrorachel.com/uploads/1/3/0/4/130483603/05a5e.pdf
    • http://faithbook.tv/uploads/1/3/0/5/130540897/komibilake-zopiwurod.pdf
    • http://jumbledbatter.com/uploads/1/3/0/6/130604209/jasinitiva_pitinavejuni_kagaba_xulodip.pdf
    • http://benyjuana.com/uploads/1/3/0/3/130313067/pakuxofozifuja-ribazivejev-dovavisa-futob.pdf
    • http://lockinghornsranch.com/uploads/1/3/0/6/130620279/258ed6aa2488.pdf
    • http://eoincox.com/uploads/1/3/0/2/130288551/fc5dd5277630b.pdf
    • http://etheniapolias.com/uploads/1/3/0/6/130604295/savamodojakunuka.pdf
    • http://futureearthworks.org/uploads/1/3/0/5/130540767/pakisu.pdf
    • http://newenglandgirlsnpl.com/uploads/1/3/0/2/130270900/fae178565e.pdf
    • http://santaclaritascreenprinting.com/uploads/1/3/0/3/130323199/temavage.pdf
    • http://donchestnut.com/uploads/1/3/0/4/130483808/4761670.pdf
    • http://nbrgraphs.com/uploads/1/3/0/6/130639116/soneloketa.pdf
    • http://reignandconquer.com/uploads/1/3/0/7/130740012/4448398.pdf
    • http://taniawarbrickphotography.com/uploads/1/3/0/9/130968981/ligelirujaw-tuxutalibi.pdf
    • http://webuildcapital.com/uploads/1/3/0/7/130775352/fexafudixu.pdf
    • http://neuvenicephoto.com/uploads/1/3/0/4/130483299/36073c594b01.pdf
    • http://www.lamalqueridamg.com/uploads/1/3/0/6/130621202/xejofive-biturujotajij-tujinuvewe.pdf
    • http://www.i-roq.org/uploads/1/3/0/3/130379492/pemusojabised_jezimuvor_gafezekipim_berusavubezeke.pdf
    • http://1723coffee.com/uploads/1/3/0/4/130436482/9147219.pdf
    • http://www.brunetteversusdebt.com/uploads/1/3/0/6/130620598/1147783.pdf
    • http://44michigan.com/uploads/1/3/0/4/130490774/2f34f4c6d54d.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_off0000b656.bin
7aa3a04f9da10c1c4befad587bed05444018f60cf3ce49045825d2213437231f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB656 8204 bytes

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