Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f39dbd40dbd69eb…

MALICIOUS

PDF

76.6 KB Created: 2021-04-03 17:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5fbe1f0c81e168df06ead221e2b37865 SHA-1: f7689363d0a7718c6c016710cbc0d7c32017dbcb SHA-256: 3f39dbd40dbd69ebbd00502ab4ae9130e33c872dd5a69c3c205afee0e53a0b86
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting an attempt to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates a tracking or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=can+you+move+an+automatic+car+in+park PDF link annotation
    • https://cdn.sqhk.co/sodelaranu/jgj1ggF/minecraft_modern_world_download.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/ancient_history_of_andhra_pradesh.pdfIn PDF document text
    • http://katermore.ru/46598481829052rn.pdfIn PDF document text
    • http://4d-5d.com/36770329041rskgd.pdfIn PDF document text
    • http://cetakchantek.com/how_to_know_when_a_car_seat_is_expired9vllw.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/central_angle_of_regular_12_sided_polygonf7hfj.pdfIn PDF document text
    • http://pagebake.com/lafovusozukesu3urjd.pdfIn PDF document text
    • http://keksik24.ru/63738906740arn5l.pdfIn PDF document text
    • http://gufutaca3.xyz/five_love_languages_test_quizc38fl.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/heUifxt/73424522038.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/27174483688s0i3k.pdfIn PDF document text
    • http://titanof-filtr.ru/fufositafozixijiwobum8spfz.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/375193ce-2dbc-4578-9eeb-c2a325179376/25868296890.pdfIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_13dbca5024ad4d0fb0fbf2ab20029440.pdf?index=trueIn PDF document text
    • http://pimobepetokonud.myartsonline.com/how_to_reset_insinkerator_hot_water_dispenser.pdfIn PDF document text
    • https://eb22cd64-ba88-4d74-9269-d2b8937e52af.filesusr.com/ugd/3b217d_16f93e3b0e0747a692dcc0e24be9dfa1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55fdcc91-f5c8-406b-9f18-f4cbb5c667dc/craftsman_pro_series_10_contractor_table_saw_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92908084-4f53-441c-a904-fef98ee542b1/74726183994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0b8a78-7522-455b-9447-8b86d40755fe/vitazuruligozufajuzipem.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_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 5000 bytes
SHA-256: 382f10e3fb779a8813bc5e7d6ddbcc68fc77414044ff48aec4a83858b8c38a4f
font_01_sfnt_off0001000d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000D 10736 bytes
SHA-256: 0e5906f0af19d8585e53aff7335ea621d5673741c2f14c91e0b9156f24bf3341

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