Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc1de0b3720f0d7…

MALICIOUS

PDF

40.1 KB Created: 2020-04-10 21:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3e3717bdf51fa189811100179e6ec1aa SHA-1: 4b18854e4570457643cef101e86517fb4e88bea4 SHA-256: 0bc1de0b3720f0d7ea09b7b8ad56e13b4031e49cb620b2b988421b3501755dcf
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a PDF link farm. The ML classifier strongly indicates maliciousness, and the document body, though garbled, contains a URL that is part of this link farm. The primary purpose appears to be directing users to numerous external sites, likely for malicious SEO or to host further stages of an attack.

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://careaidecommunity.com/uploads/1/3/0/3/130313090/130313090.html#historias+biblicas+ilustradas+para+ni%C3%B1os+preescolares
    • http://spiritualmidwiveslifecoach.org/uploads/1/3/0/5/130588700/tarewej_zapibobomepar_golowidoverib.pdf
    • http://inknot.net/uploads/1/3/0/6/130620965/5568498.pdf
    • http://sunflowerjewelsshop.com/uploads/1/3/1/4/131483685/eae62412520.pdf
    • http://happyscampersf.com/uploads/1/3/0/5/130539738/69b357d745.pdf
    • http://onevenatorculture.com/uploads/1/3/0/5/130588907/254992.pdf
    • http://athoughtforu.com/uploads/1/3/0/4/130476207/zobufas_tixige_nosegemoxuzigu.pdf
    • http://staceynails.com/uploads/1/3/1/4/131413550/a91df52e16.pdf
    • http://wooddalebaptistchurch.com/uploads/1/3/1/4/131438121/votogererafopa.pdf
    • http://creaturecomfortstm.org/uploads/1/3/0/6/130639691/1351795.pdf
    • http://katkutr.com/uploads/1/3/1/3/131383546/bb1d140e8cbee3.pdf
    • http://mcniffplumbingheating.com/uploads/1/3/0/8/130813642/gemedasadanunuju.pdf
    • http://triadinfluence.com/uploads/1/3/0/6/130639370/sovufavej_gelosifototoj_dalupevava_rifivuwesekatu.pdf
    • http://vindomoracountrylodges.com/uploads/1/3/0/7/130739577/jubepubis_resefizifofowa.pdf
    • http://cares3dlab.com/uploads/1/3/0/4/130478160/fipezetit-zunazomaded-sigituwen-japivusakan.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_off00006eeb.bin
a8578edfdd98d9ee66f814c2969bd531dcf3bea7882309f2e60503ec97a4ac0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEB 9680 bytes

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