Malicious PDF — malware analysis report

Static analysis result for SHA-256 809645fba77861b1…

MALICIOUS

PDF

48.0 KB Created: 2020-04-19 11:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3bd4e41acdfa0376e843664cd36c9f53 SHA-1: e2d871ee87b369dc55c16f6e0fcc54436fc3d823 SHA-256: 809645fba77861b1c3931a84e2c760727c56aadc053d5357790be7badaf55036
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, identified as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this assessment. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

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://marengineering.net/uploads/1/3/0/2/130287882/130287882.html#bhootni+ke+song+ming
    • http://be-resourceful.com/uploads/1/3/0/7/130739396/jipifulujag.pdf
    • http://coremedicalbilling.net/uploads/1/3/1/3/131379980/supupap_woninot_feboxuzivobizix.pdf
    • http://frontlinefreightmanagement.com/uploads/1/3/0/5/130589413/5612912.pdf
    • http://tiitiainen.fi/uploads/1/3/0/6/130640142/kizifix.pdf
    • http://pearlshousecleaning.com/uploads/1/3/0/9/130969647/wujogisiwejituw_pokezigudogi.pdf
    • http://j3vintagecollection.com/uploads/1/3/0/2/130271244/4b7b09.pdf
    • http://natru.net/uploads/1/3/0/6/130621394/2137912.pdf
    • http://rockymountainmamabear.com/uploads/1/3/1/4/131407761/larafab.pdf
    • http://marchocean.com/uploads/1/3/1/6/131607919/mabudiku-repiwojizeb.pdf
    • http://churchkatherine.com/uploads/1/3/1/3/131380569/xipito_josal.pdf
    • http://nationalcrossday.com/uploads/1/3/1/4/131407047/3773123.pdf
    • http://mjandjdistribution.com/uploads/1/3/0/4/130476896/65a96.pdf
    • http://filmandartacademy.com/uploads/1/3/0/7/130739536/lezorotome-kogafon.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fe7.bin
945a37add65a6b0ee4d4639e819a88b362866becd58827e221b4e26b4774e3c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE7 7804 bytes
font_01_sfnt_off00009e80.bin
32b54217619f9438721b423dc2f4f4da0f78781b0811ea49af2be6b0310ecf56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E80 16164 bytes

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