Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4ab69794cb53d1…

MALICIOUS

PDF

76.9 KB Created: 2021-03-06 13:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 216e2bde17e96a85d072a9b933ac4493 SHA-1: 33c3de2d150f6237770b61ebc30f90d00d4228ea SHA-256: 1b4ab69794cb53d1c6785670b87acaa29b5e919e95e0faf333055130e4ff70f5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/123?utm_term=espn+30+for+30+lance+armstrong+canada PDF link annotation
    • https://divetuguwopad.weebly.com/uploads/1/3/0/7/130739619/5839327.pdfIn PDF document text
    • https://videxopejevis.weebly.com/uploads/1/3/5/3/135333638/sojuvimuguxe.pdfIn PDF document text
    • http://o-karte-kopilka.com/xageniwabedis9vog.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/how_does_simv_mode_workysxll.pdfIn PDF document text
    • https://jokasagumejede.weebly.com/uploads/1/3/1/0/131070006/vabewubojak_babedame.pdfIn PDF document text
    • https://jibotofixox.weebly.com/uploads/1/3/4/5/134502829/1713037.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/fazewagigilaru.pdfIn PDF document text
    • https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/127152.pdfIn PDF document text
    • http://idealica-tufficiale.website/super_cat_tales_2_walkthrough_4-_6ydogj.pdfIn PDF document text
    • https://tiseworadew.weebly.com/uploads/1/3/5/3/135317060/7164535.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/hard_american_history_trivia_questions_and_answers.pdfIn PDF document text
    • https://xowogibudul.weebly.com/uploads/1/3/4/4/134446034/vogixobavudugaz-wetadi-gewuviwuxikiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/muvevanepen/finulaxusegop.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/nujesonusese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ce85db-55f7-48a2-8bf2-9ff6aeb4f1b4/6761501924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5571571-bb39-45f8-9fd7-771868dcc400/free_printable_book_report_forms_for_4th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24ab635d-c694-497c-a9ec-600019b94bd9/what_are_the_four_personality_colors.pdfIn PDF document text
    • http://seroroxunabolu.onlinewebshop.net/wibiraxewexapufebez.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/77144414465.pdfIn PDF document text
    • http://rixigor.onlinewebshop.net/bigolaguzi.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/jejusamupovavupudixiwul.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/48752905688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40c8c6c6-025c-4a51-93de-b5ae623531db/resumen_libro_para_leer_el_pato_donald.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00E 5476 bytes
SHA-256: 1331f485e4daf2a979ed83f9e660e2868069818b139036ab2317158a071e6eb3
font_01_sfnt_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 11020 bytes
SHA-256: 2e4a8b792b87d072008371b0768a981f243ca68f654c407a10fcf40c619ed091
font_02_sfnt_off000117fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378