Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee6ac0c24ac7d74…

MALICIOUS

PDF

36.5 KB Created: 2020-04-04 15:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f7752c4df5fa50473fd454f67885fceb SHA-1: 4614d725656a34fd6c7f95f9dd9a66b7f295f1ea SHA-256: cee6ac0c24ac7d74e0590eb453539ec0d683fc35c497e8ab51dbce541fd4ac51
94 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier. It contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO spam operation. One of the embedded URLs is http://wdtwesterndownstimber.com/uploads/1/3/0/7/130775623/130775623.html#kenmore+dryer+replace+belt, which appears to be a lure for users searching for appliance repair information. The document body contains garbled text mixed with some of these URLs, further indicating a non-standard or obfuscated purpose.

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://wdtwesterndownstimber.com/uploads/1/3/0/7/130775623/130775623.html#kenmore+dryer+replace+belt
    • http://josephinelonetti.com/uploads/1/3/0/7/130740342/nikuw.pdf
    • http://blackbeltworldatclayton.com/uploads/1/3/1/3/131383931/9878689.pdf
    • http://cdafestival.org/uploads/1/3/0/7/130739592/befuwuniwajemafiv.pdf
    • http://safecitiescoalition.org/uploads/1/3/1/0/131069904/218448.pdf
    • http://gatosolo.net/uploads/1/3/0/4/130476089/3979910.pdf
    • http://buynonobaby.com/uploads/1/3/1/0/131070246/nudoterosubomulexoda.pdf
    • http://kometkleening.com/uploads/1/3/1/0/131070489/6db3821694.pdf
    • http://trindigo.info/uploads/1/3/0/3/130379336/4382433.pdf
    • http://theoverwatchreport.com/uploads/1/3/0/2/130272284/nunude.pdf
    • http://imaginethat3dprinting.net/uploads/1/3/0/8/130814382/9401600.pdf
    • http://cherrysmallengine.com/uploads/1/3/0/9/130969522/vuwumigujew_wurawi_nawuzavasi.pdf
    • http://cozypineapplecaps.com/uploads/1/3/0/7/130776872/784078.pdf
    • http://zoenorris-mecfs-recovered.com/uploads/1/3/0/4/130475959/68521.pdf
    • http://faithandplaystories.org/uploads/1/3/1/0/131070167/6645447.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_off000068ae.bin
75ff89d7a14be7f7b2a474252b4477a74c8296a6c4086167cf266c19d0cb0c12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68AE 7284 bytes

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