Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c676a632d60e007…

MALICIOUS

PDF

40.2 KB Created: 2020-05-13 03:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 209cfbae7f7f50d135d9734131fef467 SHA-1: ef55cf61145356dc1b12fc972d5817c5c925b92a SHA-256: 3c676a632d60e00775455f427718af28c271b9815e36138b579e8da3130d3249
96 Risk Score

Malware Insights

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

This PDF file was flagged by an ML classifier as malicious. It contains a large number of external links, many of which point to other PDF files hosted on various domains, suggesting a link farm or SEO spamming operation. The document body contains a lure related to 'flipkart answers 2019' and the authoring application is wkhtmltopdf, indicating it was likely generated programmatically. The primary attack pattern involves directing users to a multitude of external URLs.

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://clickinteriordesign.net/uploads/1/3/0/4/130488846/130488846.html#guess+what+flipkart+answers+2019
    • http://ustreehuggers.com/uploads/1/3/0/2/130272385/saxuvuzobilora_bojizivi_gozoj.pdf
    • http://buildwithsrc.com/uploads/1/3/1/6/131637055/100d27.pdf
    • http://sabgebaudeservice.de/uploads/1/3/0/5/130551890/jasosiwagijigeb.pdf
    • http://gehringarchitecture.com/uploads/1/3/0/7/130738620/ccebade6609d63f.pdf
    • http://abscofacilitymaintenance.com/uploads/1/3/1/0/131070934/mazubadabate-jomepawuwapi-banupumi.pdf
    • http://unitedpowersforfreedom.com/uploads/1/3/0/2/130291800/kokewajakige.pdf
    • http://sportscarmanagement.com/uploads/1/3/1/8/131857383/folofasibajiwadesa.pdf
    • http://schoogl.com/uploads/1/3/1/4/131438098/6805532.pdf
    • http://pof-freeaddcalls.com/uploads/1/3/0/6/130621547/xukezirev.pdf
    • http://repiping.net/uploads/1/3/0/7/130738554/8a9212daad6d69c.pdf
    • http://cleanseatuk.net/uploads/1/3/0/4/130483748/vanabumavovem.pdf
    • http://ericksontravel.net/uploads/1/3/0/4/130435666/5784185.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_off00005992.bin
8e80dfbe6cccb2a8bda1363d209847bc37c5c0c1e2f0edf0c4313e997dcc60c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5992 11272 bytes
font_01_sfnt_off00008031.bin
ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8031 16164 bytes

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