Malicious PDF — malware analysis report

Static analysis result for SHA-256 12692f03634fe268…

MALICIOUS

PDF

31.4 KB Created: 2020-06-19 23:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54041d88d34255c842b60bc9af88e99f SHA-1: 76178a9218eda4c469337e938188d8d97ccbd11a SHA-256: 12692f03634fe26864ce9e6dd87d4dee34003551ac52b814de2601c48c304049
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are structured as a link farm. The document body, though heavily obfuscated, contains references to 'Cambridge English for Media' and includes several URLs, suggesting a lure to phishing or malware distribution sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

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://catalog.iiprintnow.com/uploads/1/3/0/9/130969423/130969423.html#cambridge+english+for+media+pdf
    • http://bullsnips.com/uploads/1/3/1/4/131406527/6238150.pdf
    • http://mta-sts.pollensharks.com/uploads/1/3/0/5/130590122/loxodotez.pdf
    • http://watereddownsprite.com/uploads/1/3/0/6/130605259/mujobinu.pdf
    • http://papabillstroutguideservice.net/uploads/1/3/0/5/130545429/futawixinif-fafepobuxekuxil-selilos-lasuwopixe.pdf
    • http://seatedsucculents.com/uploads/1/3/1/8/131871486/tepajepo.pdf
    • http://parents.sprigeo.com/uploads/1/3/1/3/131379824/9763717.pdf
    • http://impacttb.org/uploads/1/3/0/6/130639675/8803725.pdf
    • http://laurenandrobert.nl/uploads/1/3/0/7/130775131/zutewirewi.pdf
    • http://antraflooring.com/uploads/1/3/1/3/131383998/7663365.pdf
    • http://sunrise-communication.net/uploads/1/3/1/4/131437425/visonobanaj-pivisukopabipub.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_off00004174.bin
fc6e98254598a845ec0f9702394e289c77126075a8bd986a12347de935a95385		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4174 5328 bytes
font_01_sfnt_off00005353.bin
169637c4bcde992001c3c7e152d17c8fe4fea9f81bf489600fac90c1f021c8dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5353 8748 bytes

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