Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4b881121430cb7…

MALICIOUS

PDF

116.2 KB Created: 2021-04-07 03:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c8c991daa5c738cd02f8949d4820ef81 SHA-1: fbe82bb9d3190fd915b4fa9607d9ddf2022b1f9b SHA-256: ef4b881121430cb77f4f195cd30c6a0c710df61294852fd22b2c683a581f2146
126 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains references to 'jumbled sentences worksheets' and the authoring application 'wkhtmltopdf', suggesting a lure for educational materials. The embedded URI points to a URL on 'bologen.ru' which is likely the intended destination for the user, indicating a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bologen.ru/award?keyword=jumbled+sentences+worksheets+for+grade+2+pdf PDF link annotation
    • http://detonicinitalia.website/saxadegape62jjo.pdfIn PDF document text
    • http://magic-spring.com/28097428202iuo70.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/49503554360.pdfIn PDF document text
    • http://1pokypki.website/banner_saga_leveling_guidegunbz.pdfIn PDF document text
    • http://poguzozod.sportsontheweb.net/51195294011.pdfIn PDF document text
    • http://flowerport.market/25356771924ia5k.pdfIn PDF document text
    • http://nojekufa.22web.org/53690484624.pdfIn PDF document text
    • http://inostrana.com/what_do_you_wear_to_a_summer_garden_partyjejsf.pdfIn PDF document text
    • http://re-prime.ru/2008_dodge_grand_caravan_headlight_bulbxzx1x.pdfIn PDF document text
    • http://g2am2e.xyz/navanurepen3265y.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/71d17233-bbba-45d5-beef-367c255ff902/30000849729.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_3898340d87c04cf4928673dfbb4f298d.pdf?index=trueIn PDF document text
    • http://magivaxinel.rf.gd/free_powerpoint_template_ideas.pdfIn PDF document text
    • http://redifigikutusoj.myartsonline.com/53716927648.pdfIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_0c6c9e41dd0e4bd5987d431b459cf4af.pdf?index=trueIn PDF document text
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_da44f4227a894ef5bddd0d2172927769.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a8a44e4-1a7e-4c03-91d3-c40bd502f586/kenmore_two_door_refrigerator_not_cooling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a15ce3-c81e-4611-8063-7744da970c21/will_tesla_reduce_prices_in_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e959cee5-349d-45d0-a862-79195eb2e1c8/how_to_pair_rii_mini_i8_to_firestick.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e963ac4-f397-4da8-be3e-5ada5db4e922/dumogimiforonibugix.pdfIn PDF document text
    • http://wokanulobasanek.epizy.com/el_manifiesto_comunista_karl_marx_y_federico_engels.pdfIn PDF document text
    • http://wuviwalot.rf.gd/jivezurozevevoxawu.pdfIn PDF document text
    • http://gezixus.myartsonline.com/definition_of_applied_social_sciences.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_off00018722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18722 5984 bytes
SHA-256: 8ab27f0cd29772ba5ac79383951294969ee2edaae0a45c8a6190ecce0ee55488
font_01_sfnt_off00019b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B67 11088 bytes
SHA-256: 3088fed71afc3e0bacaf16cb0eff5992fa9b272a5bb826a457d4d7c0b389714c

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