Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef66a7efc75aa2b8…

MALICIOUS

PDF

94.0 KB Created: 2021-03-15 00:24:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d5dabf4dfc8b7e83002abb8f40e1dbe SHA-1: 5120628419a97ce42488a014f3f02454ed0704a4 SHA-256: ef66a7efc75aa2b8b5f190f8f940ce6539ee81df9dcae11eb309d813ccde36fd
96 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 an embedded URI pointing to 'zajinet.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=cof+fault+codes
    • https://cdn.sqhk.co/pavujakorige/jdKjiyp/chalk_duster_full_movie.pdf
    • https://cdn-cms.f-static.net/uploads/4402481/normal_603c216bd3ccb.pdf
    • http://barajofa.mywebcommunity.org/33195816614.pdf
    • http://nomenowunesazoz.scienceontheweb.net/5556440925.pdf
    • http://wofudanupata.22web.org/lamborghini_gallardo_lp_570-4_superleggera_2011.pdf
    • http://maruwikugob.iblogger.org/53488604527.pdf
    • https://cdn.sqhk.co/reriwoduriju/2Djafhi/ice_hockey_skate_sharpening_near_me.pdf
    • https://cdn.sqhk.co/tokokoxisuf/Rieja33/application_letter_format_for_school_bonafide_certificate.pdf
    • https://cdn-cms.f-static.net/uploads/4446152/normal_602e628c16e62.pdf
    • http://mikiduvedopavu.22web.org/odometer_discrepancy_form_tn.pdf
    • https://cdn.sqhk.co/kokedipemi/iciiibu/double_infinity_symbol_meaning_wikipedia.pdf
    • https://cdn-cms.f-static.net/uploads/4486778/normal_5fd1f7c77a220.pdf
    • https://cdn.sqhk.co/dusimefosix/P5uXihy/bollywood_box_office_2020_wiki.pdf
    • http://zevixoleg.iblogger.org/favevawemasijatefiriw.pdf
    • http://jafetezaki.iblogger.org/21426095312.pdf
    • http://kevogam.22web.org/tobev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_8be77464a12b4ad89c83d056d835975e.pdf?index=true
    • https://8ea4a4fb-2859-49e6-8c89-66ed49166bb4.filesusr.com/ugd/0088c1_035edb966d3449fa9b03cabc09837253.pdf?index=true
    • http://sawesupunozigiv.atwebpages.com/kezazopamewidu.pdf
    • http://gobonelore.epizy.com/braums_menu.pdf
    • http://dupikupujetilu.rf.gd/rukewizimewog.pdf
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_3afd710a94014069afa372f50825ffd3.pdf?index=true
    • http://mejumobax.atwebpages.com/77134475897.pdf
    • http://powosegunivu.epizy.com/73721758768.pdf
    • http://pigibotokaper.epizy.com/22960854837.pdf
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_c2e4425f8e7d48178758013904539b17.pdf?index=true
    • http://tuxabatadifu.onlinewebshop.net/vitamin_b12_deficiency_symptoms.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012743.bin
d68ed91aad861fe59936cfa86c85b5ebc27dd0b47333995af38f138471e5bef2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12743 4668 bytes
font_01_sfnt_off00013733.bin
ad7d68130d980c0fde14c60bd894bbf385f0a2614504c1e192c89774039a1549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13733 10940 bytes
font_02_sfnt_off00015c55.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C55 4324 bytes

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