Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b949a6b1fab3b1…

MALICIOUS

PDF

44.1 KB Created: 2020-05-19 04:39:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c543deabe943411e5a8dfbe8e6ddb0e4 SHA-1: d21e53d5a8b307d5be02b7c045f80b836a1852e0 SHA-256: c9b949a6b1fab3b1227d96b7d428f86871cf9e52438ebf1d225146c1ed9ebae9
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded document body text, though corrupted, contains fragments of URLs and metadata suggesting it was generated programmatically to create a link farm. The primary purpose appears to be directing users to numerous external sites, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ecolegwern.org/uploads/1/3/0/4/130490774/130490774.html#cgp+gcse+physics+revision+guide+answers
    • http://thetravellingteddy.net/uploads/1/3/0/8/130813883/7818466.pdf
    • http://raffaelescettro.com/uploads/1/3/0/9/130970004/9509834.pdf
    • http://virtualdigitalbank.org/uploads/1/3/0/6/130620887/3d3671424ee.pdf
    • http://virginislandseverything.com/uploads/1/3/1/3/131383719/dodanidizunawadepoxa.pdf
    • http://my-pmc.net/uploads/1/3/0/5/130589214/mavikasa.pdf
    • http://iniiyamba.com/uploads/1/3/0/6/130621058/34fb6.pdf
    • http://cjglitter.com/uploads/1/3/1/4/131409264/40d0888fbf0d02d.pdf
    • http://livinghopedurango.com/uploads/1/3/1/8/131872281/8821067.pdf
    • http://wellreadpro.net/uploads/1/3/0/7/130738566/sezijezitogen-gakomudupol.pdf
    • http://mrnicecream.us/uploads/1/3/1/4/131437375/9841aaf7e53.pdf
    • http://skinnydogconsulting.com/uploads/1/3/0/5/130544746/528867c6.pdf
    • http://swamped1.org/uploads/1/3/0/7/130739887/2cf047e10d1ee5.pdf
    • http://pinalashess.shop/uploads/1/3/0/6/130639600/monerexakesir-lesapikalegova-nepemisoruve.pdf
    • http://sunsetinnagain.com/uploads/1/3/0/5/130543059/gorezopuwepife.pdf
    • http://starplusmedia.com/uploads/1/3/1/1/131164476/jipegabawoz.pdf
    • http://sparkleandshinewithchristi.com/uploads/1/3/1/6/131636698/kiweduxopilex_rudunatorosupa_najuna_teputu.pdf
    • http://lwoodsllc.com/uploads/1/3/0/4/130488512/powumorigej.pdf
    • http://chynomusic.com/uploads/1/3/1/3/131378923/pavilewel.pdf
    • http://noleftright.org/uploads/1/3/1/0/131071073/5d1fb4f21faaca.pdf
    • http://danishtarivero.com/uploads/1/3/1/3/131381134/2316410.pdf
    • http://buckheadvendors.com/uploads/1/3/0/5/130538996/8906868.pdf
    • http://barspyder.com/uploads/1/3/0/3/130313113/5570603be2f60a2.pdf
    • http://bookchelsea.com/uploads/1/3/0/2/130288520/10676.pdf
    • http://independentlivingfortheaspiringmusicianmerchandise.com/uploads/1/3/1/8/131857029/vafati.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_off00007e5b.bin
2e58b2348d340ae32a6225f699685fa7c1bae771e784304afcf0c93c9c4eb2c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5B 11048 bytes

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