Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4cdbee0606059b…

MALICIOUS

PDF

81.9 KB Created: 2021-04-23 15:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3c9b87517aea11339e3b2499cd028d70 SHA-1: bb393c46860702e5b7cebaf4457cc7873e85419a SHA-256: 3c4cdbee0606059bf3700e035a0dfdca7538e49b00ad33b9a7bd64c8c42694f6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=the+valley+of+horses+audiobook PDF link annotation
    • https://segurabo.weebly.com/uploads/1/3/5/9/135964373/3690943.pdfIn PDF document text
    • https://jutemutugitut.weebly.com/uploads/1/3/4/6/134617260/379425da0a.pdfIn PDF document text
    • https://cdn.sqhk.co/jaselavujuwi/CggDgfj/rabanu.pdfIn PDF document text
    • https://jasugigikimodo.weebly.com/uploads/1/3/1/3/131383258/tanedavugixapa.pdfIn PDF document text
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/3557720.pdfIn PDF document text
    • http://gukapeb.iblogger.org/child_info_form.pdfIn PDF document text
    • http://fogejebimo.scienceontheweb.net/ielts_writing_answer_sheet_idp.pdfIn PDF document text
    • https://cdn.sqhk.co/nisifowisom/fhfge3H/blockly_maze_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/hLzhegj/29050551886.pdfIn PDF document text
    • https://wafedegexusib.weebly.com/uploads/1/3/0/9/130969596/219555e6b.pdfIn PDF document text
    • https://cdn.sqhk.co/kusonemap/djbichg/party_city_hippie_costumes_for_mens.pdfIn PDF document text
    • https://pakipetunora.weebly.com/uploads/1/3/4/8/134881281/78e9cb0c4f2c0a.pdfIn PDF document text
    • https://raxuzorozejataw.weebly.com/uploads/1/3/4/0/134042373/fulovizimetav.pdfIn PDF document text
    • http://lotibamuzuti.scienceontheweb.net/larousse_gran_diccionario_espaol-ingls_english-spanish.pdfIn PDF document text
    • http://gogejevi.iblogger.org/afscme_contract_illinois.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/mejigavukolu/3836488468.pdfIn PDF document text
    • http://jomopizemiz.onlinewebshop.net/59725667553.pdfIn PDF document text
    • http://vowetuki.rf.gd/super_mario_land_2.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/oh_danny_boy_sheet_music_violin.pdfIn PDF document text
    • http://deguwesipi.rf.gd/bewutuzi.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/what_goes_well_with_red_wine_jus.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_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 5308 bytes
SHA-256: 43e8fecb9405e63f15eeb64fc5a1b102a5f102c262792e7a48855c71841f5c96
font_01_sfnt_off00011508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11508 11208 bytes
SHA-256: 77e4dd555e0b1027a816a0ff7bc949861b3990bb32f8de8f7769d309723c0296

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