Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed93e363598437b…

MALICIOUS

PDF

36.8 KB Created: 2020-04-09 06:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c77800953569cbba684c461439d67aa3 SHA-1: 56508abdfaa99b0040296e398dd0e91c9c1f9059 SHA-256: 7ed93e363598437b3ed1ec3f59cc1877eda049c4532d4246ed409e8d5dafa4f3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, contains text suggesting it is related to reading PDF books on Android, which is likely a lure. The primary intent appears to be driving traffic to these external sites, potentially for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://elecplumbuk.com/uploads/1/3/0/6/130639835/130639835.html#best+app+to+read+pdf+books+on+android
    • http://productionriggingdepartment.com/uploads/1/3/1/3/131381369/7ac3bcdbe9.pdf
    • http://tarutiscollc.com/uploads/1/3/0/7/130776737/7cd37f1cbd89882.pdf
    • http://lawrencepestpros.com/uploads/1/3/0/4/130478760/476de962b55.pdf
    • http://makeyourowncake.com/uploads/1/3/1/4/131483287/1762666.pdf
    • http://juniperhillequestrian.ca/uploads/1/3/0/7/130738511/2b2ddb.pdf
    • http://n3rdhow.com/uploads/1/3/0/6/130604807/2a7058688f.pdf
    • http://nilarajagopal.com/uploads/1/3/0/7/130739004/1ce1279.pdf
    • http://ammppo.com/uploads/1/3/0/2/130289205/gegutini_tumip_joriwexazef.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_off000065f9.bin
71bcd5e6d5425dc600d869d564b0d62b5299e4bbb55b05411d7c4b0e214abd93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F9 8500 bytes

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