Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcef28f843c4602…

MALICIOUS

PDF

74.4 KB Created: 2021-03-17 00:03:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 24dc17bac9cc0192baed27154458fc86 SHA-1: f8a1a9936dd2f7498f7233b8aa2cbf3a3cf59846 SHA-256: 3fcef28f843c46021851d7c5627abf387cc880e96683f6e8fa1af540b5bf8033
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, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The document body, though heavily obfuscated, suggests a lure related to internet, mobile phones, and social networking, likely intended to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=advantages+and+disadvantages+of+internet+mobile+phones+social+networking+wikipedia PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389394/normal_5ffc97b47e7e8.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/wubogekagoruk.pdfIn PDF document text
    • https://jijixedo.weebly.com/uploads/1/3/1/3/131398351/xowopo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502188/normal_5fd65d7bafdbd.pdfIn PDF document text
    • https://giliwafe.weebly.com/uploads/1/3/4/0/134016831/pogazewepusevez_sefetazaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450418/normal_60350cae6c621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451018/normal_5fe69ae17678b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_6021f4d3d8cbf.pdfIn PDF document text
    • http://jabewes.medianewsonline.com/how_do_you_write_measurable_goals_and_objectives.pdfIn PDF document text
    • http://bepifukikuku.mygamesonline.org/corpus_linguistics_book.pdfIn PDF document text
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/depiduniso-gejixelixipega.pdfIn PDF document text
    • https://vodoxakitukep.weebly.com/uploads/1/3/4/3/134335140/seborel.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/2bfbc318-c8a6-4399-983f-5aafafed838d/place_value_calculator_game.pdfIn PDF document text
    • http://xijejuvi.myartsonline.com/84042041264.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/93859722585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abff1732-3025-494a-8e44-26a5df94f308/usps_correct_zip_code.pdfIn PDF document text
    • http://sawesupunozigiv.atwebpages.com/50846891540.pdfIn PDF document text
    • http://pizuzol.onlinewebshop.net/zeduromezuvowobulakebot.pdfIn PDF document text
    • http://dilutibu.onlinewebshop.net/54074560017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9709c8bc-6015-4767-9cbe-792d325bd674/kukovajoxalujamitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206302bc-8b8e-443c-b589-8941138e0c5d/can_you_keep_a_secret_rating.pdfIn PDF document text
    • http://kufekisawisewo.onlinewebshop.net/59459880061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2cdd190-b2f0-48db-bf3e-b4aa2d0215d6/which_pressure_cooker_is_best.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_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 5912 bytes
SHA-256: 6a90e35b377cc940dd425a62704fc29f0c23b88e5fc88d89e6a418f68e220a40
font_01_sfnt_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 9976 bytes
SHA-256: 882e534f8ac7a239db2caeabc42bd7db659cfcd5525d2af36b7f874a7d5a1298

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