Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94d54b2123d6b1b…

MALICIOUS

PDF

35.8 KB Created: 2020-06-25 00:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23f12b8ef0947abdb042a500ebc30be3 SHA-1: 4218049f5ae12a105679ff75517ceb6f2b7a0230 SHA-256: a94d54b2123d6b1b2d25ce5ceccb6f93de70bc24432f17ca542a660f16205100
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains numerous external links, a common tactic for SEO poisoning and driving traffic to malicious sites. The document body, though obfuscated, contains text related to 'free pemdas worksheets' and the wkhtmltopdf application, suggesting a lure to educational content. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm indicates a likely attempt to redirect users to potentially harmful content.

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://y1fkf.slpny.com/uploads/1/3/0/4/130483961/130483961.html#free+pemdas+worksheets
    • http://ggaragefab.com/uploads/1/3/0/6/130621873/1814550.pdf
    • http://tinakuhncommunication.net/uploads/1/3/0/6/130639374/semematubuxarat.pdf
    • http://whimsicalwellness.com/uploads/1/3/1/1/131164372/933714.pdf
    • http://releasecurve.com/uploads/1/3/0/2/130287295/zezagazat.pdf
    • http://groundswellfoundation.org/uploads/1/3/0/5/130588772/b459ff2ecbe.pdf
    • http://leisure-charters.com/uploads/1/3/1/4/131438304/xinitusif-mefumadetiki-revagedupeg-vaxipimidagigev.pdf
    • http://mlhconsultancy.com/uploads/1/3/0/5/130542717/925879.pdf
    • http://cryofabindustries.com/uploads/1/3/0/6/130603935/xerusewozix_mobaso_fubaniti_fanirubelune.pdf
    • http://necklesforjudge.com/uploads/1/3/0/6/130604785/af2769b185f.pdf
    • http://74-123-78-61.mgwnet.com/uploads/1/3/0/8/130874474/xulifalamunu.pdf
    • http://australiantrappers.com/uploads/1/3/1/4/131407687/bisizarelova_xulud.pdf
    • http://warwickmoss.com/uploads/1/3/0/6/130604006/doxufesikuf.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fed.bin
cdb400b7f08da9d27903a7928e4dae061f55b29c0fda8c0b92ba4ae0aa8c6e7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FED 4912 bytes
font_01_sfnt_off000060ad.bin
7f18911a3e2f22ed0b5bd2c08bce272517bc001ab91ba367a789aade1a605e4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60AD 10040 bytes

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