Malicious PDF — malware analysis report

Static analysis result for SHA-256 35123d7de5505af6…

MALICIOUS

PDF

86.4 KB Created: 2021-03-18 17:31:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e0b439631f3ba9a420bd1ff2194e6f6d SHA-1: dc02dc08096fd0c89c46703fb67639ede30b646c SHA-256: 35123d7de5505af6611ae2460a64952707ce27a5df91948f45c4ed43596434c1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an external URI pointing to a suspicious domain, and heuristics indicate it's part of a link farm designed to direct users to potentially harmful content. The document also contains instructions to disable security software, a common tactic in phishing and social engineering attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://botokaw.ru/award?keyword=gleichungen+aufl%25C3%25B6sen+aufgaben+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410448/normal_5fdac5b45e9f3.pdfIn PDF document text
    • http://introdom.ru/how_much_sugar_is_in_dunkin_donuts_refreshersh5upv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5ff450a6746fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483623/normal_6034e99d61871.pdfIn PDF document text
    • http://thelait.pro/digital_crime_and_digital_terrorism_3rd_editiont6oqo.pdfIn PDF document text
    • http://wiinorama.fun/deluzofabuowu29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370762/normal_6004d94fcb0aa.pdfIn PDF document text
    • http://technodom11.com/21467910390dcx43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374835/normal_5feffb159b88e.pdfIn PDF document text
    • http://dihtyar.online/91801565593pw21o.pdfIn PDF document text
    • http://pixell.store/18064469379vdpco.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388163/normal_5fe1f7fa61dd6.pdfIn PDF document text
    • http://seplafond.xyz/what_is_the_blue_book_value_of_a_2014_ford_escape7f26o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380528/normal_602d54eb9997e.pdfIn PDF document text
    • http://lotto-investclub.com/nonifagulinilaroganudoc6wf2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f109fd4e-637c-4955-bf8f-1fe9dab510b4/sureko.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/dufalilowefubirizod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ca3abc-fc72-4c5e-b05d-c6e02b809c7d/tokyo_ghoul_season_2_opening_song_name.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/pidajidixivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f76904-5c27-46f1-93a5-6cff5b1942cf/how_to_repair_crack_in_whirlpool_tub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfda4c01-38c4-4077-b83c-114a76df3675/delonghi_magnifica_s_cappuccino_coffee_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/jigawe.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_off00011072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11072 5628 bytes
SHA-256: 25e8686e0388c7b46ac1e774f06510ac55d92a1daeeb4857ca5d62fde5a7345f
font_01_sfnt_off00012356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 11968 bytes
SHA-256: 12469356e6eedd06574d7d6c3a21db86beec2cd976afa2d94de1de2d570969fd

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