Malicious PDF — malware analysis report

Static analysis result for SHA-256 523a2b5bb78abf74…

MALICIOUS

PDF

71.8 KB Created: 2021-01-27 18:30:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7dd94b12d4a415694bf2d0fc8f01c4d5 SHA-1: 653dded4b9711da44bbe0945fc30b8bd9eb66932 SHA-256: 523a2b5bb78abf742c66ecd36018b0a321c5ccfdf5c151db6ed0af2867d23da7
226 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The 'Fake CAPTCHA' heuristic indicates the document attempts to trick users into interacting with it, likely to drive traffic to these external URLs. ClamAV detection and ML classification further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://maypoin.ru/123?utm_term=avengers+academy+free+shards+no+surveys PDF link annotation
    • https://zibaxewax.weebly.com/uploads/1/3/4/6/134699960/xejav.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/S2ihjbV/efootball_pes_2021_mobile_app.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/dx4mtja/dwayne_haskins_contract.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/MAhcxic/chestburster_scene_spaceballs.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/fihiiPk/first_world_war_history_in_tamil.pdfIn PDF document text
    • http://ita-fitness.fun/kuwatahv915.pdfIn PDF document text
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/mesalipunasujulavu.pdfIn PDF document text
    • http://fajutixosisi.22web.org/favewagusexerelagamona.pdfIn PDF document text
    • https://meruxanige.weebly.com/uploads/1/3/1/6/131636855/3516523.pdfIn PDF document text
    • https://cdn.sqhk.co/dolavalof/Xhghcna/3d_game_maker_software_pc.pdfIn PDF document text
    • https://jeripakituwimug.weebly.com/uploads/1/3/2/6/132695489/derefuju-jogak-wesepe-mejadofufi.pdfIn PDF document text
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/damijenavuzube.pdfIn PDF document text
    • http://kulokozataxat.22web.org/puritan_bennett_840_manual.pdfIn PDF document text
    • https://kawavaturitavo.weebly.com/uploads/1/3/5/3/135321378/3462119.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zokitidekav.epizy.com/75710500759.pdfIn PDF document text
    • http://rumajajoneder.rf.gd/avast_cracked_apk.pdfIn PDF document text
    • http://juwesuzibu.epizy.com/ng-_bind-_template_in_angularjs.pdfIn PDF document text
    • http://pakatikik.epizy.com/cooking_academy_4_restaurant_royale.pdfIn PDF document text
    • http://tikikenuf.epizy.com/17899619515.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_off0000d9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B6 5552 bytes
SHA-256: 8c444d45b5ff1841a1befbf8d6f5f9c2d48513da5ada66dccd6e1d299b8be053
font_01_sfnt_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 10956 bytes
SHA-256: 4fff205bd1db7dc4480df0986d49c99733151e5b9540f6ec89e8f8ee579c33c2

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