Malicious PDF — malware analysis report

Static analysis result for SHA-256 34da8b2736d8d82b…

MALICIOUS

PDF

75.1 KB Created: 2021-03-09 05:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 75c5b54c9de75b87907cda25046f5d03 SHA-1: 2832c8e42078a07dd82e7ac657feadefe6ef4d1f SHA-256: 34da8b2736d8d82bcba63924d0a98c3f4b28f545ff479d8d00a2db99d0d466c9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=saitek+x52+drivers+64+bit PDF link annotation
    • https://jewefero.weebly.com/uploads/1/3/1/3/131383264/gudinomubefotefa.pdfIn PDF document text
    • https://cdn.sqhk.co/temazajilib/hcJchdE/snapchat_suspicious_login_text.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/fuSLvhg/27258718226.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/4ijV0hj/fantasy_heroes_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/JhdLUjd/kewoletulipes.pdfIn PDF document text
    • https://susakatevasek.weebly.com/uploads/1/3/4/8/134871092/legeluwi-fuwadado-pobisal-kemeranixe.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/jcUhf9J/6860449355.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/hjfbiih/gaming_sound_effects_pack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/ijihgd5/transparent_clock_and_weather_widget_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/Ui8eib3/cake_recipe_ideas_chocolate.pdfIn PDF document text
    • https://cdn.sqhk.co/lijuwezasip/aFkl1Ua/5646992002.pdfIn PDF document text
    • http://tekufebuxu.iblogger.org/fulolemalibimelomu.pdfIn PDF document text
    • https://cdn.sqhk.co/loxusovi/4ugfijs/56146699217.pdfIn PDF document text
    • https://bojozavo.weebly.com/uploads/1/3/0/7/130740433/52c0c88e8.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/hjb5hhB/gonuguguzalo.pdfIn PDF document text
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/bafiraketupe-kojibaviwez-fixobaset.pdfIn PDF document text
    • https://rapinawenag.weebly.com/uploads/1/3/0/9/130969945/6586318.pdfIn PDF document text
    • https://cdn.sqhk.co/vekokizijam/bichbRr/pefuv.pdfIn PDF document text
    • https://fozejabaf.weebly.com/uploads/1/3/5/3/135305581/6aa670dc5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bepukugi.rf.gd/episode_1301_chemistry_answers.pdfIn PDF document text
    • http://rumalitufe.rf.gd/53868704056.pdfIn PDF document text
    • http://boponewutizubi.rf.gd/payday_2_holdout_guide.pdfIn PDF document text
    • http://zozafiromilofin.epizy.com/61749636131.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 5720 bytes
SHA-256: 8b8f4d07264bc674d1f3ff6d1b877ea0767fde3e37962a528ee865fabbdd71c7
font_01_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 11336 bytes
SHA-256: c908ca7fb02fa7b58f9ad2e8be42ad7cad82932e8cc2ce9a8e7bebcc37bc237e

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