Malicious PDF — malware analysis report

Static analysis result for SHA-256 6548cfe7fdaef497…

MALICIOUS

PDF

37.1 KB Created: 2020-04-12 11:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 09327b4b0b1f6d71d8472efa1a3fa08c SHA-1: 326f7448f9c864c170f5736d2d658541d9d923d3 SHA-256: 6548cfe7fdaef49717b73d58cf73d458916fe0487a8fde7d4e486ad73ebabd62
96 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with a heuristic firing indicating a mass of external PDF links. The ML classifier strongly suggests maliciousness, and the embedded URLs point to numerous external PDF documents, likely intended to redirect users or manipulate search engine results. No scripts were extracted, but the structure and numerous external links suggest a malicious intent to lead users to potentially harmful content.

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://marketforceonline.info/uploads/1/3/0/9/130969592/130969592.html#nikkor+35+f2+ais+flickr
    • http://ioniccs.com/uploads/1/3/1/4/131453246/ziletap.pdf
    • http://bestofwachusett.com/uploads/1/3/0/7/130739660/kofujisubirako.pdf
    • http://yourbrainisbeautiful.com/uploads/1/3/0/7/130739294/c6d49859a78b60.pdf
    • http://kristinarevphotography.com/uploads/1/3/0/6/130639449/puzobupiz.pdf
    • http://chopstir.com/uploads/1/3/0/4/130476047/abd26cba2.pdf
    • http://lovesmotion.net/uploads/1/3/0/5/130551191/ladesunupevaze.pdf
    • http://footy.tours/uploads/1/3/1/1/131163867/7201182.pdf
    • http://318cvadenver.com/uploads/1/3/0/6/130622116/346bea601b9.pdf
    • http://publicidadzamora.com/uploads/1/3/0/6/130604801/2781486.pdf
    • http://the-pampered-hare.com/uploads/1/3/0/7/130775927/95c0eb5c5fb09.pdf
    • http://amygery.com/uploads/1/3/1/3/131398174/joporenusogo_nikalalomoz_dusezemas.pdf
    • http://dianemarrapodi.com/uploads/1/3/1/4/131453193/8379217.pdf
    • http://widerangeoffers.us/uploads/1/3/0/5/130589121/b99a86.pdf
    • http://fudoglandscaping.com/uploads/1/3/0/5/130590432/tumirozu_degifa_juketod.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_off00006850.bin
1894a5d81aaf7d373609e5cbb54b71b62d3908db3bc7daf57ca2cbfd13526058		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6850 8184 bytes

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