Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2023bd08e335952…

MALICIOUS

PDF

72.3 KB Created: 2021-02-18 20:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8b7162317b344b1076631b38dcdd7000 SHA-1: c1e99de803f1bf985e445960820c602d4afdead9 SHA-256: e2023bd08e33595241d4cb7ef1f4e7f58e7b86c335a34ae8197a86ce50f998ad
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, characteristic of a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this behavior. The ML classifier also flagged the PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of numerous external links suggests a mechanism for downloading further payloads, potentially via embedded JavaScript, which is common in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=dark+souls+2+strategy+guide+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/xafiguzi/fAMgihd/fikuwab.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/fjb6ujb/video_call_recorder_application.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/ihjfCgh/51455087046.pdfIn PDF document text
    • https://lijimoxa.weebly.com/uploads/1/3/0/9/130969704/nimimagevat.pdfIn PDF document text
    • https://cdn.sqhk.co/besiwowegin/i1XbU0X/phase_10_card_game_buy_online.pdfIn PDF document text
    • http://naxiramomamaz.66ghz.com/59072617849.pdfIn PDF document text
    • http://mivejuvididu.66ghz.com/why_will_my_husqvarna_lawn_mower_not_start.pdfIn PDF document text
    • http://komujevakikumu.22web.org/laselapovore.pdfIn PDF document text
    • http://tevojagi.iblogger.org/sheetz_inc_claysburg_pa.pdfIn PDF document text
    • https://linezajokopu.weebly.com/uploads/1/3/4/6/134629872/1712634.pdfIn PDF document text
    • https://cdn.sqhk.co/telazaje/he7aYoN/original_battleship_game_ships.pdfIn PDF document text
    • http://bitipusefotas.66ghz.com/oobleck_lab_answers.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/nitizobuv/tafipozano.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/calculating_gross_pay_with_overtime_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/how_to_set_time_on_woods_light_timer.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/conditional_proof_questions_and_answers.pdfIn PDF document text
    • http://bajivuselome.epizy.com/alquran_gratis_untuk_hp.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_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 5600 bytes
SHA-256: e82dd30e25384a2874702400f783c8a6d7750f1bc91f3abe3f03926fae03a13b
font_01_sfnt_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 11016 bytes
SHA-256: a2e5b14bb464a06fef689e81ae7476afed7d084013cf6eef4ecac281120dfa4b

Open this report in the interactive analyzer, or submit your own file for analysis.