Malicious PDF — malware analysis report

Static analysis result for SHA-256 72849def2b8ff498…

MALICIOUS

PDF

33.0 KB Created: 2020-03-17 13:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9dc265a8e47123a2c758fc16ad62f61b SHA-1: 246e58add9b3ea12794c928afdda8a81f42b4cf7 SHA-256: 72849def2b8ff4984c880fec3cf9bef10fa094d7bd33625671b8144c4d1b5773
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on unrelated domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of external links points to a likely attempt to distribute malicious content or manipulate search engine results.

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://holoholofuntravel.com/uploads/1/3/0/8/130873784/130873784.html#planar+density+for+fcc+110
    • http://walterspaintingco.com/uploads/1/3/0/4/130483429/1c4c4b33c4dc35.pdf
    • http://www.highwealdshepherdhuts.com/uploads/1/3/0/8/130874102/funevosesoluzijaw.pdf
    • http://jrkbconcreting.com/uploads/1/3/0/2/130271161/4995818.pdf
    • http://marzenaugorna.pl/uploads/1/3/0/2/130289682/dinipusoj_zebag_tufipenin_gadulab.pdf
    • http://www.tiffyjackproductions.com/uploads/1/3/0/4/130475959/texepuxek.pdf
    • http://faithlutheranmarysville.org/uploads/1/3/0/8/130813934/boxubijoxoginujo.pdf
    • http://theinkpadshop.net/uploads/1/3/0/6/130621098/b598240cf64a.pdf
    • http://nickihumblesbridalbeauty.com/uploads/1/3/0/6/130603896/7c303d25cd.pdf
    • http://sportscritic.net/uploads/1/3/0/4/130476589/88494f107784bc.pdf
    • http://augustapickleball.org/uploads/1/3/0/7/130775558/taponidamoba_linomusavive_mikiwiku.pdf
    • http://62fdu8qkhq0.butterfly520.com/uploads/1/3/0/7/130738681/zager.pdf
    • http://sweattafit.com/uploads/1/3/0/2/130289800/5469734.pdf
    • http://www.caytegrieve.com/uploads/1/3/0/6/130605438/febudowamarabutezaj.pdf
    • http://ardentnetwork.com/uploads/1/3/0/2/130287527/vufiv.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_off00005949.bin
a0c3f5d12fb2168db3095d758fe4d7bb2ac5f360197fbcc7019b9dda69a0b281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5949 7532 bytes

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