Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c399552d6e76409…

MALICIOUS

PDF

39.8 KB Created: 2020-06-17 09:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f03f43516770bb5e931fc03ba9d32813 SHA-1: c4db6c74e86ec661b05e37e428890adbae5b94eb SHA-256: 0c399552d6e76409ed3158b8515c9231fd393cff3f2513d51ea8989e203231b4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which are structured as SEO-optimized PDF links, suggesting a link farm or redirection scheme. The primary heuristic indicates a mass external PDF link farm, with one URL pointing to a potentially malicious HTML file. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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://cpanel.overburyarts.com/uploads/1/3/2/3/132302987/132302987.html#leisure+fridge+freezer+hja6100+manual
    • http://dragonboutique.org/uploads/1/3/0/5/130539933/lofexoz-gisapifu-fukiwedala.pdf
    • http://outofthewoodsheather.com/uploads/1/3/0/5/130550880/refidedelebur_bexulun_wedotabezemala.pdf
    • http://easyupstair.com/uploads/1/3/0/2/130272242/61b9ab8922ce705.pdf
    • http://mx.quenchmemphis.com/uploads/1/3/0/9/130969957/nasakomejefixogo.pdf
    • http://cpanel.roanyscollectibles.com/uploads/1/3/0/2/130289171/lufisetuxododikupafo.pdf
    • http://chatthillscommunity.com/uploads/1/3/0/2/130289252/fogepuxeza.pdf
    • http://74-123-79-170.mgwnet.com/uploads/1/3/1/6/131606065/kunibakogefasizori.pdf
    • http://shanenvyhair.com/uploads/1/3/0/7/130776385/keladixuv.pdf
    • http://forterraacquisitions.com/uploads/1/3/1/3/131378913/xovonidu-weliki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e68.bin
732b74b1b9c2ac88aa995534755db91417e2a01e219b87e93a722d6954a2ede1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E68 5428 bytes
font_01_sfnt_off000070b9.bin
820e270024d42ab23621c91529d31cdbefa36b5519135eba7d5dbb333da67adf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B9 9952 bytes

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