Malicious PDF — malware analysis report

Static analysis result for SHA-256 875cd15bc39a5352…

MALICIOUS

PDF

76.9 KB Created: 2020-05-31 03:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd714d513ea0108ce691dfb6ea51f4f7 SHA-1: 37b01bb0eaa324b87fbd9ddc6d6c03368181d725 SHA-256: 875cd15bc39a5352fcbe73b7ce5e27993e29e0b608d7709ab4221a7121dd3448
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves directing users to these external sites, likely for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://nelasanchez.com/uploads/1/3/0/4/130476180/130476180.html#free+1999+mitsubishi+montero+sport+r
    • http://oraclereadings.com/uploads/1/3/0/6/130621132/9f71338.pdf
    • http://lorenzoilmagnifico.solutions/uploads/1/3/0/8/130874389/gunafipigimoxebe.pdf
    • http://ballersbars.com/uploads/1/3/0/5/130539820/novigudonegawejato.pdf
    • http://pcpanelsolutions.com/uploads/1/3/0/5/130590122/rotofedodisokod.pdf
    • http://alekamd.com/uploads/1/3/0/7/130739416/1728190.pdf
    • http://webmail.btoilfield.com/uploads/1/3/1/3/131380032/tezunuguw-ridonokodumim-gepipurajoduna-feduwi.pdf
    • http://bradleyhartmanbakken.net/uploads/1/3/0/7/130775154/xavelinuxegutul_nuzun_lojex_fobinosajiguzom.pdf
    • http://whitesilentwisdom.com/uploads/1/3/0/6/130604884/7920608.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_off0000df77.bin
98a5458b8a82cd99aaececbd5067a217aa021cc9fc10547f51b267089aaee315		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 8792 bytes
font_01_sfnt_off0000fcdf.bin
ae180629ff783c29221ee598ac64cf7eecac91b55a1e2adf7b85fdc6a3df5d40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 12728 bytes

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