Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a493e3e02b0d88…

MALICIOUS

PDF

73.8 KB Created: 2021-03-28 10:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7dbf54b16d3f7fd5fc817e399b2bca23 SHA-1: c63baa9003042f91a9d9636cab635004279793bf SHA-256: f4a493e3e02b0d88d2ef02ea37c3834729f0a9e9f3a33ad6f1035d0f155cc1c0
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://resalured.ru/123?utm_term=miya+bhai+song++ringtone+dj PDF link annotation
    • https://cdn.sqhk.co/jivonaxadu/jifhjWe/home_designer_dream_house_hidden_object.pdfIn PDF document text
    • https://wupugilitem.weebly.com/uploads/1/3/6/0/136020535/widirovuketuxalini.pdfIn PDF document text
    • https://doxefifuz.weebly.com/uploads/1/3/0/9/130969363/texov.pdfIn PDF document text
    • https://cdn.sqhk.co/pugipepa/cgdjaxw/panibiri.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/pronouns_and_antecedents_worksheets.pdfIn PDF document text
    • https://tubemugipowiw.weebly.com/uploads/1/3/4/3/134345788/9547761.pdfIn PDF document text
    • http://filuxunokenobud.mygamesonline.org/cowboy_chicken_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/cgdjiNq/infinity_sign_apple_music.pdfIn PDF document text
    • https://fagadixiridare.weebly.com/uploads/1/3/5/3/135304990/wafigapetet-gurigedir-bokaxativux-letowesijewot.pdfIn PDF document text
    • https://venolebibu.weebly.com/uploads/1/3/5/3/135348563/gotimanalojiral-tudopu-pakabebemo.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/car_mot_checklist.pdfIn PDF document text
    • https://cdn.sqhk.co/leburogutu/0Dhdfjf/37608257827.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/09065154-d593-4d4f-9272-83af7fa22939/forezuves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b559cba-b2a5-4f61-bed0-b3afd9913823/mens_health_gym_bench_with_weights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71573876-e34c-4214-a1bc-e1b6f7ea7fa2/7494077216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b9ec261-8b24-4ef1-8a72-55d6d06a85f0/fuwozewinevepeluwobewup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/107dff47-5804-4d4d-98ca-8cfd6d8aed60/biwub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4edec33c-4f48-48ed-830e-907d429a02a5/is_the_stock_market_open_today_and_tomorrow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c6e6c72-d91d-46c3-b616-f995bb1f0ad5/doluzuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f783e2-b3fc-4a49-82ca-869959f49811/wu_tang_series_cast_imdb.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/zojirushi_rice_cooker_instructions_brown_rice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d54271dd-acd1-44ad-90c1-c21b220c74f5/wahl_hair_clipper_kit_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b242336a-2747-4a55-9329-909a97b0840f/37808356454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/265454d8-9a58-428b-a357-9f9d793e9eec/prince_lionheart_premium_wipes_warmer_instructions.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_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 5376 bytes
SHA-256: edc8a930589c93b784ff1aa2dba9d478817656ca04d415fd793ee4b2a7fee025
font_01_sfnt_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 13556 bytes
SHA-256: 51e84bc63d78341c843d7f1d052a083f3ee5f242032d523692590aee4e1d437f