Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a2e0c563fefef1…

MALICIOUS

PDF

86.5 KB Created: 2021-04-30 22:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1dac1218b2f4c5cae3439e475694924a SHA-1: 7d65963943a3f233420bac208ac3bfe204f3028d SHA-256: 35a2e0c563fefef13a0c2441df2cde694148431bd28618e813c9e91aeb751f5b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of a fake CAPTCHA heuristic suggests a social engineering tactic to deceive the user into performing an action. The document contains numerous embedded URLs, many pointing to disposable hosting or link farms, which are commonly used to redirect users to malicious sites or download further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to lead the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://zajinet.ru/strik?utm_term=oster+convection+oven+french+door+manual PDF link annotation
    • https://wozogerodinanu.weebly.com/uploads/1/3/4/4/134498855/wutufepan.pdfIn PDF document text
    • https://mateboxabivof.weebly.com/uploads/1/3/4/7/134763458/40399.pdfIn PDF document text
    • http://zuxuvikewi.sportsontheweb.net/how_to_convert_word_document_to_on_mac.pdfIn PDF document text
    • http://sakivometo.medianewsonline.com/aspergers_symptoms_checklist.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/fgdQjfN/74442323320.pdfIn PDF document text
    • http://roxetoxuved.mywebcommunity.org/rituel_pour_attirer_l_argent_avec_le_sel.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/Shbgjxk/fesadiveroseneme.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/classroom_objects_list.pdfIn PDF document text
    • http://zuxemesemubozo.mywebcommunity.org/pafobilukerejovazaletezi.pdfIn PDF document text
    • http://jebebixazonutug.mypressonline.com/sesanenileligi.pdfIn PDF document text
    • https://fivoputan.weebly.com/uploads/1/3/1/4/131408393/3dfdd.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/nilititonawafim/35454370130.pdfIn PDF document text
    • http://rodisasedozax.myartsonline.com/77553911588.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/85590039000.pdfIn PDF document text
    • http://gajutar.onlinewebshop.net/editable_bingo_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5262a328-ec8b-4300-873c-d322734904ae/answer_key_for_eureka_math_grade_6.pdfIn PDF document text
    • http://suxudogakol.myartsonline.com/nirenuwofosituwos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6855c332-59af-4872-a24f-4cbd1be679e1/what_is_a_lab_write_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3abab266-5069-4847-bf4d-dd557011e2d6/kanso_sound_processor_cp950.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_off0001132e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 5348 bytes
SHA-256: c8b10cc0878d87ac8aa7a8ce6cf63af8f7e864f51437423e103ef25c132199a5
font_01_sfnt_off00012537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12537 11812 bytes
SHA-256: 1b9a3a1cc640fdedcc66969eb19ee54a02cd54f53fe43aafb5ffc248201cea75

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