Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a27b50462e25ec8…

MALICIOUS

PDF

72.3 KB Created: 2021-05-29 12:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71024a49dcce48adcdbb1cad542d1472 SHA-1: 96f18fb722126a3d512a125e6f1984defb2bb281 SHA-256: 3a27b50462e25ec86c696d52adc9ad5c0866e8048c3adf1db806dcd2abf70283
196 Risk Score

Malware Insights

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

This PDF document functions as a lure, presenting itself as a free download for a textbook. It contains a large number of external links, many of which point to other PDFs, suggesting a link farm or a method to distribute malicious content. The presence of a password-protected archive lure heuristic indicates that the document is likely intended to trick users into downloading a password-protected file, which often contains a secondary payload. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://botokaw.ru/strik?utm_term=harper+bioquimica+ilustrada+30+edicion+pdf+descargar+gratis
    • https://cdn-cms.f-static.net/uploads/4392877/normal_603af7f2d0ae0.pdf
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/63cda277695bcaa.pdf
    • https://dapifakefigev.weebly.com/uploads/1/3/1/6/131636612/wekajeririxopup_bemik_zitaximut.pdf
    • https://cdn-cms.f-static.net/uploads/4489035/normal_5fd17dd17dac0.pdf
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/jevidapet_punigazubume.pdf
    • https://cdn-cms.f-static.net/uploads/4481988/normal_5fdc2faf1c1eb.pdf
    • https://static.s123-cdn-static.com/uploads/4369779/normal_5fce79da52771.pdf
    • https://gulawunobuxag.weebly.com/uploads/1/3/4/6/134627092/budajibizobetitu.pdf
    • https://lagubezawepafu.weebly.com/uploads/1/3/1/8/131856446/374aebc7ffd225.pdf
    • https://cdn-cms.f-static.net/uploads/4489976/normal_60395efbc37c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d1011744-318b-48a2-8437-c687f006717f/kajovowegifavobewusexed.pdf
    • https://uploads.strikinglycdn.com/files/f4362268-6953-4056-afce-177f619ed465/69269680258.pdf
    • https://uploads.strikinglycdn.com/files/d35a5de7-b272-4edb-a1c6-dfcfa082a5ab/introductory_chemical_engineering_thermodynamics_2nd_edition_solutions_manual.pdf
    • https://uploads.strikinglycdn.com/files/cbc20b45-34f2-4ea7-91ad-2a6986fb068f/suxudaj.pdf
    • https://uploads.strikinglycdn.com/files/347d7ef3-b90b-42a0-8c5f-c64e5744249c/icivics_represent_me_answers.pdf
    • https://uploads.strikinglycdn.com/files/d398c467-3dc9-4412-89db-261a54b6498a/how_to_transfer_ebooks_to_kindle_app_on_iphone.pdf
    • https://uploads.strikinglycdn.com/files/7452a51c-19f2-463d-bf89-49a8ec39637d/manual_para_tocar_guitarra_acustica_para_principiantes.pdf
    • https://uploads.strikinglycdn.com/files/e7bb59a4-84c8-43d7-b6d7-d0c74f93a750/keto_diet_recipe.pdf
    • https://uploads.strikinglycdn.com/files/6f49a22a-b1f1-4bd9-afa9-ead78315680e/34305167840.pdf
    • https://uploads.strikinglycdn.com/files/66107539-89a3-4a51-9f2f-5293d5284f80/38302124131.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_off0000d7c9.bin
acd4a39f9bd3ef91b8c7ebdbf7b1bb725162b3e5d6e0c509097ff320daa80183		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 6008 bytes
font_01_sfnt_off0000ec18.bin
67d38f5437b8cd3b12407c69e724c19953dfd505309b4eda3280098c9b4ac389		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 11544 bytes

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