Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7911d13c3c3ba1…

MALICIOUS

PDF

108.9 KB Created: 2021-03-15 12:48:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 505d08c99c76e41022af2534d04bf23e SHA-1: 7bce07c57f1f44951119333856de93b24bbe615a SHA-256: 9c7911d13c3c3ba185c970d08fc46663817d49ec5abd6801f35b73b821b7ba27
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of outbound links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of many external URLs points towards a redirection or content-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://kuzutuzo.ru/strik?utm_term=what+is+transcendental+meditation+technique
    • https://cdn-cms.f-static.net/uploads/4367668/normal_6037a76ec3900.pdf
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/xatoxezugoxexus.pdf
    • https://cdn-cms.f-static.net/uploads/4495050/normal_60432f2fd523a.pdf
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5fd686bad403e.pdf
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/9819257.pdf
    • https://static.s123-cdn-static.com/uploads/4368492/normal_5fde902f4728c.pdf
    • https://votumojelobi.weebly.com/uploads/1/3/4/8/134848055/7071253.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tuxalowafokuvo/2373381796.pdf
    • https://s3.amazonaws.com/fifomi/help_to_buy_scheme_reservation_form.pdf
    • http://gugakalorezo.epizy.com/what_does_the_bible_say_about_loneliness_kjv.pdf
    • https://s3.amazonaws.com/wanasuvedigo/13907250310.pdf
    • https://s3.amazonaws.com/wufujudisu/62994283921.pdf
    • https://s3.amazonaws.com/mevuzokekenojab/3544294706.pdf
    • https://s3.amazonaws.com/lijulijowivaze/zubepazakofizopek.pdf
    • https://s3.amazonaws.com/tubukeganuji/cron_job_format_unix.pdf
    • http://zinikifog.rf.gd/nexijujoxo.pdf
    • https://s3.amazonaws.com/ragejufa/b._o._t_android_game.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016c14.bin
d395f006010fc082cc72fc6597564c5ac65e75f46d91c19cc88b61afc82cbb20
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C14 5316 bytes
font_01_sfnt_off00017e03.bin
3fb3c00950d987eae03a1bed7708af2b668fbb27a321c9f7743ba6f322583c09
pdf-font-stream PDF embedded font (sfnt) at offset 0x17E03 11936 bytes