Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5b02afb4a767af…

MALICIOUS

PDF

85.6 KB Created: 2021-03-14 00:32:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1d900e7ef008909f93f727c8a8c809c2 SHA-1: 233ab7e22ceb39c57c7a95e91d7703e84c0c35b3 SHA-256: 5c5b02afb4a767af12124b7b9795bc5584fae274c47be72f69fdcc6f2fe40cc6
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and potential use in SEO-based phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://druttle.ru/award?keyword=english+malayalam+dictionary+pdf+download PDF link annotation
    • https://cdn.sqhk.co/mixaluwekitu/zigZjb0/68861686355.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/6hhjihj/four_words_game_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/hHVxJig/tebadilewufofijilikawapus.pdfIn PDF document text
    • https://cdn.sqhk.co/senosekagoko/f4wgdFE/battleplans_best_hero.pdfIn PDF document text
    • https://cdn.sqhk.co/xizojotozodi/ejhhehc/draw_a_stickman_epic_2_free_no_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/jde5bLC/zejawi.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/hf7hd8X/33514671453.pdfIn PDF document text
    • http://minomesiguziv.22web.org/bahubali_100mb_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409616/normal_60110d36dbe89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411701/normal_5fd98e3b7509f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464056/normal_601dc04701c64.pdfIn PDF document text
    • https://cdn.sqhk.co/duxajoje/ibifjg2/73920453009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_5fd76c205b6bd.pdfIn PDF document text
    • https://cdn.sqhk.co/gozigawefo/gf0hhgj/75408496493.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://basezilevuwegiz.epizy.com/flowers_for_algernon_character_chart.pdfIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_55dbf0608b4d40a79613992c90b89e6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecffd0f1-2ae0-44e2-9b30-effae1f9cd58/easy_french_books_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2242166-bdea-42b0-8dd2-388063b099db/95629447818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/854b1347-6d4d-4829-acf0-0e3a52ba225b/deworasawif.pdfIn PDF document text
    • http://molamizaxe.epizy.com/19613852758.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_1e730a593712463896a1b4774bcaf7ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/32818769-ae83-42a8-a836-00ca8d3375ac/dorazemo.pdfIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_365e61cd0cb24e60bd928f4a89dd758c.pdf?index=trueIn PDF document text
    • http://soditunasi.rf.gd/batman_arkham_knight_riddler_challenges_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 5720 bytes
SHA-256: a8665b8dfa4c8ed7e222902b1d3f97959e8c1c01e3a1e3ff7057c59b3fec7c2c
font_01_sfnt_off0001086a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 11336 bytes
SHA-256: 3846358c173f06180b2d0f49b435287e321749a9ce6efdba0f6c3f98ca9abf3e
font_02_sfnt_off00012f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5D 17116 bytes
SHA-256: 14694618630e9e835006d8c4f42157f6eaf1e0bd96b9dc1cdb87afc2069f9066

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