Malicious PDF — malware analysis report

Static analysis result for SHA-256 3271d495810233cb…

MALICIOUS

PDF

74.5 KB Created: 2021-03-20 00:35:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3db5cc93b67d20469492ce5aa2fca6f2 SHA-1: 29a4818ca6927258c151f430178f2534dcc42621 SHA-256: 3271d495810233cbcfb91024c29fbefce80e39f00913186cf1dd94a0681c59a3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or malware distribution, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to printer toner reset, directing users to potentially malicious URLs like https://ponafet.ru/strik?utm_term=brother+hl3170cdw+toner+reset. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=brother+hl3170cdw+toner+reset
    • https://cdn.sqhk.co/xugikokazo/zBUifjj/28683167301.pdf
    • https://nipukidifa.weebly.com/uploads/1/3/0/8/130873732/1197873.pdf
    • https://mabamakozipapap.weebly.com/uploads/1/3/4/3/134315796/651e2bc872.pdf
    • http://linza.media/686145274049il4r.pdf
    • http://olivamebel.com/who_played_bruno_in_the_boy_in_the_striped_pyjamas4dgw0.pdf
    • https://cdn.sqhk.co/xamitarerivu/dgj0Ngg/assembly_line_worker_jobs_near_me.pdf
    • https://cdn.sqhk.co/sifujubagis/azp96hj/40414705115.pdf
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/9429eb220ebf11b.pdf
    • http://lajodibibodi.getenjoyment.net/bojakigifo.pdf
    • https://cdn.sqhk.co/fulaxanew/iik8haI/sea_monster_city_cheat_apk.pdf
    • http://wedurorokim.mypressonline.com/m_a_internal_communications_plan.pdf
    • https://cdn.sqhk.co/guxudakakali/jcT4hkG/gorofibogopavaxugaz.pdf
    • https://betozuwozoz.weebly.com/uploads/1/3/4/1/134108580/2b70575d.pdf
    • https://cdn.sqhk.co/tazifawixax/bjfgh9M/39956775757.pdf
    • https://cdn.sqhk.co/niwexifa/sibghk3/vusujojosuli.pdf
    • https://cdn.sqhk.co/lazimafuxuxi/cZHiiw2/word_collect_answers.pdf
    • https://cdn.sqhk.co/jabosuve/jehabhX/10454506436.pdf
    • https://cdn.sqhk.co/ronuwimo/hctCZvA/gagafagime.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e16d1d95-cddd-4cfa-a989-6401b4e0e06a/international_finance_corporation_washington_dc_address.pdf
    • https://uploads.strikinglycdn.com/files/7c9dffb8-8c78-4f64-92d1-44868615eca1/past_simple_present_perfect_exercise_doc.pdf
    • https://uploads.strikinglycdn.com/files/d568c7c2-0402-4709-8b6b-8b1e070983e1/samsung_un55d6000_factory_reset.pdf
    • https://uploads.strikinglycdn.com/files/1dd46646-870a-4b03-91cd-51a3dd943d8b/amazon_fire_tablet_10_user_manual.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_off0000e339.bin
db0c030926427a4d2ca8455aad9ddfa236b00249a34180c9a4fbd6eabd03281e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 5396 bytes
font_01_sfnt_off0000f5ac.bin
db026061235cfbca40ae73cbacc512c82038ff12b909b4738a3ad629bc3bd46a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 10804 bytes