Malicious PDF — malware analysis report

Static analysis result for SHA-256 3588758c7833d9bf…

MALICIOUS

PDF

74.3 KB Created: 2021-02-18 13:06:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1679598efe9a3370ead566db8e4f0f49 SHA-1: 38b0494c3e17caa9896d3925619726b9c7a0177e SHA-256: 3588758c7833d9bf1b3380ccefa373016c4d4147ac43922765187f3605601d98
186 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains references to 'Canon mg3122 error codes' and 'wkhtmltopdf', indicating a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/strik?utm_term=canon+mg3122+error+codes PDF link annotation
    • https://letogapebo.weebly.com/uploads/1/3/5/3/135320268/04a91cb22b.pdfIn PDF document text
    • https://sujosajuzatitoz.weebly.com/uploads/1/3/5/3/135312362/bilisemegevi.pdfIn PDF document text
    • https://kofagegupuk.weebly.com/uploads/1/3/2/3/132302723/betulo_nunejisa_mujoma_negonufelegogo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476148/normal_5ffc12da46126.pdfIn PDF document text
    • http://talebakela.iblogger.org/pokazamedefew.pdfIn PDF document text
    • https://tatefazaseg.weebly.com/uploads/1/3/4/0/134016926/48cc75e7a170b1d.pdfIn PDF document text
    • https://nunigagajil.weebly.com/uploads/1/3/4/7/134751499/3109ec5cec22e01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408462/normal_5fee91e60ea17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_6027759941935.pdfIn PDF document text
    • https://noserosajegupa.weebly.com/uploads/1/3/1/4/131453720/7758435.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414169/normal_5fe0708132848.pdfIn PDF document text
    • http://fuwenosod.iblogger.org/87625944321.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mokixetat/instagram_photos_and_videos_android.pdfIn PDF document text
    • http://lekinip.epizy.com/f2l_algorithms_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/dewabusakesetatitedawuku.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/agar._io_hack_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/violin_and_viola_duet_sheet_music.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_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 5480 bytes
SHA-256: a0bd5e14dbc08641fe5d938b7b00555a79b1cc7cc141d4e13e28243de022dc0a
font_01_sfnt_off0000f64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 10780 bytes
SHA-256: d723a863501b798590609b85e4aa697b986be92a791f94b5e01ed35ec5222459

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