Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a15c7281b572ee…

MALICIOUS

PDF

121.0 KB Created: 2021-03-09 09:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a85012d82a09646c5fc724e73eddf5a1 SHA-1: 728180e8fe8e9dc0b42ad00e4e2580942637f34d SHA-256: 80a15c7281b572ee5bdca33449152cddfe54aec6fe2bfb8d12d55700ade09296
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one notable example being 'https://gimoguvi.ru/award?keyword=animal+cell+culture+biotechnology+pdf', suggesting a phishing or malware distribution lure. The presence of embedded URLs and the PDF structure itself points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/award?keyword=animal+cell+culture+biotechnology+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379854/normal_5fe13d798ad53.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/didihii/iron_superhero_war_superhero_games_mod_apk.pdfIn PDF document text
    • http://pivolirarorip.mypressonline.com/how_many_carbs_in_a_soft_chicken_taco.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464527/normal_5fc7bf487755a.pdfIn PDF document text
    • http://zakofuta.66ghz.com/embedded_questions_exercises_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467576/normal_60265f5d6a950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_5fdb7c3147ac4.pdfIn PDF document text
    • http://jisorozasakima.iblogger.org/58501313662.pdfIn PDF document text
    • https://cdn.sqhk.co/nesuxozajek/iM7OjjP/kobijevoxezoxekano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458849/normal_600b344c7e170.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/tajugivituborunugasilose.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
    • http://rowoniwetob.atwebpages.com/king_lear_summary_in_hindi_video.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/suspension_letter_format_for_school_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba1d08b8-e9e5-4d46-ba6d-615ec03beeb9/is_the_summer_i_turned_pretty_a_movie.pdfIn PDF document text
    • http://xikimafelote.epizy.com/47246831871.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/91373649713.pdfIn PDF document text
    • http://ponodorivodub.rf.gd/why_my_iphone_battery_is_draining_too_fast.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/21722322658.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/22774477262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0276df4e-5984-4ef4-aec1-f21802f59945/3824978468.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/dobofawinivewupubev.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_off000191c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191C6 5504 bytes
SHA-256: 970328b78dfa3c247f4d42fd72e5a876906960fe6911fa45b57f3e98fa57ec45
font_01_sfnt_off0001a442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A442 10496 bytes
SHA-256: bb9a2bad6fa5fa72043381aaf5feb61b50f8ec4e510f107cafb24c49b277dea8
font_02_sfnt_off0001c817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C817 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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