Malicious PDF — malware analysis report

Static analysis result for SHA-256 d310cf4da1e93a9d…

MALICIOUS

PDF

76.9 KB Created: 2021-03-17 03:13:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3baf75b6506834e95e7267bdd58fddec SHA-1: bb5c53acfea3db3d822957f67c4385cbc3d047b3 SHA-256: d310cf4da1e93a9d18480ea5df38d049fe53dcca766301ea4abfcd31a94b3db4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains or Weebly-hosted PDFs, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these linked documents. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

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://druttle.ru/strik?utm_term=symbol+ls4278+configuration PDF link annotation
    • https://gadonivoxe.weebly.com/uploads/1/3/5/3/135331758/e31871a6c4f.pdfIn PDF document text
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/4c3eb0e03.pdfIn PDF document text
    • http://wutulesarox.iblogger.org/disney_cars_coloring_pages_free_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/wumidimux/ji4gMhc/easy_funnel_cake_recipe_without_baking_powder.pdfIn PDF document text
    • http://lngcliente.com/good_graphic_design_portfolio_examples3iuk1.pdfIn PDF document text
    • http://chtotakoebezuz.biz/wahl_elite_pro_clippers_complete_haircutting_kit_79602xkrkj.pdfIn PDF document text
    • http://balifruit.com/naxazotisa0wh79.pdfIn PDF document text
    • https://cdn.sqhk.co/felibepudu/3dajhiL/fenokelolodu.pdfIn PDF document text
    • http://com-copyrighit.com/sharepoint_server_2013_sp1_download_iso003jx.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/ibQjjVN/car_simulator_m5.pdfIn PDF document text
    • http://manekobe.22web.org/90749430607.pdfIn PDF document text
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/wenalaliti_zuxudibid.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://uploads.strikinglycdn.com/files/a8cf61ec-5a29-4ad3-9c5d-b32991f1f1ff/multivariate_analysis_meaning_with_example.pdfIn PDF document text
    • http://werewej.epizy.com/ct_guided_si_joint_biopsy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/408b1859-6530-44eb-a226-ae625fae4981/kitchenaid_professional_600_series_6-quart_stand_mixer_cover_pattern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44143221-b39d-474a-8232-05c04b1574c8/wotujesugow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9022a1c9-89d3-41d9-bf45-45a1d51f671f/68597341117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/523dd3ad-df44-4f80-b4e0-57c97361b62c/lixuvagotibopafilakad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93881007-8116-441c-a6bb-4011262ac024/dunkin_donuts_latte_sugar_content.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ac224a-0ff7-4c56-8b14-3b733c87c096/bowexipugaxuwenalurakat.pdfIn PDF document text
    • http://sufelubunat.epizy.com/anestesia_general_inhalada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05eef4f8-633d-4da2-a9e7-170080aad18c/jimazekifemogapuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59a6cef4-1d48-4f45-a29c-99e1afa1dcaf/najanijikusadaripififibu.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_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 5804 bytes
SHA-256: fafe9538033a6ba07b1aaf1180b0d294d08ac975b3266dc1b8ab90cecfd2d5d0
font_01_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 10836 bytes
SHA-256: d9576f45ff42e971aab9336bfdbe458711b1a1934997e7c9f906069c7a9f9d55
font_02_sfnt_off0001166b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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