Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffe87726dc8f53a…

MALICIOUS

PDF

41.6 KB Created: 2020-04-10 11:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c9ff58837a9abce1c13f06d912dfafc5 SHA-1: 25906d4f454a606c5e7333d5b960b5cbd267b89b SHA-256: fffe87726dc8f53a1ea50930c102f686dbb575f52cb557dc36c2bcd34c7fd810
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files on various domains, indicating a link farm or SEO abuse tactic. The document body, though partially corrupted, contains references to a novel summary and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs supports the conclusion that this document is designed 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://extravirgincoffee.com/uploads/1/3/1/3/131379548/131379548.html#the+big+sleep+novel+summary
    • http://neutralskincare.com/uploads/1/3/0/3/130313056/3758907.pdf
    • http://adcounselling.net/uploads/1/3/0/5/130590665/b24d7caf5.pdf
    • http://vancouvercounselingandtutoring.com/uploads/1/3/0/5/130544468/ralonagifa.pdf
    • http://torres-hvac-technologies.com/uploads/1/3/0/6/130605279/bd95c009fe.pdf
    • http://shamyat.net/uploads/1/3/0/7/130775572/133aa9375.pdf
    • http://canuplaysport.com/uploads/1/3/0/3/130379210/kuvuriw-lunuzox.pdf
    • http://gayea.com/uploads/1/3/0/5/130588625/xojibobigil_xefetase_medoripemo.pdf
    • http://ftgculture.com/uploads/1/3/1/4/131437689/4a8d5.pdf
    • http://danceballroomnj.com/uploads/1/3/0/8/130813860/kubidizugi.pdf
    • http://nejmandesign.com/uploads/1/3/1/4/131409508/73f415b40574.pdf
    • http://rooseveltstables.com/uploads/1/3/0/6/130605002/273351.pdf
    • http://lubeko-invest.com/uploads/1/3/1/0/131070705/4318906.pdf
    • http://beeoesch.com/uploads/1/3/0/4/130436439/lafifefob.pdf
    • http://salonandgardens.com/uploads/1/3/0/8/130815013/4979977.pdf
    • http://bridgendgranite.com/uploads/1/3/0/2/130287428/nifipizekaki_sazafepupo_limuzipolewinan.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_off00007cf0.bin
664e7a9e5a37ec0246a3732a5c8210fbb74f167d8053e17dfcb2e4c5c357bdce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF0 7284 bytes

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