Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd4eb963fab7531…

MALICIOUS

PDF

85.4 KB Created: 2021-03-25 04:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 899aad4baeae144df48431d27e203658 SHA-1: ebe5c3bdce07910ce87a872d259d829d64c02aad SHA-256: afd4eb963fab75318d59db3550835c5b903c4ca500c8549fcc869b533a2bf81f
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an external URI pointing to zajinet.ru, which is likely part of the lure to download a secondary payload. The presence of a 'download button' heuristic further supports the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=astrology+books+pdf+in+kannada PDF link annotation
    • https://cdn.sqhk.co/jaselavujuwi/Idhiihf/vebamudo.pdfIn PDF document text
    • https://cdn.sqhk.co/diwelamu/jhgu4jc/filter_coffee_machine_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/gqRqijg/jizavirovewipogat.pdfIn PDF document text
    • http://fuxezaboxekave.scienceontheweb.net/nawejimuzepo.pdfIn PDF document text
    • http://xobilosusi.sportsontheweb.net/electrophilic_substitution_reaction_of_pyrrole.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/je61hdu/20695351928.pdfIn PDF document text
    • https://cdn.sqhk.co/rojisixel/ihahfK1/bagamejibam.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/bhjiguM/88883400784.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/dIx01f9/working_solar_system_science_project.pdfIn PDF document text
    • https://cdn.sqhk.co/muwanije/iYRWjji/flight_city_airport_to_frankfurt.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/5c9292a1-e59c-40c9-87c4-73472c9e2396/how_to_critique_a_jazz_concert_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f08b93-2af2-47ad-abe6-c3914fe48ae7/what_is_personal_pronoun_for_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c239ee-c8e6-4c28-bcf6-c0288cbef629/34239749952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eab053b-0db8-4fc9-baf9-6e84fcba318d/subway_surf_apk_indir_para_hilesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3591736-578e-49c7-80ea-b135338858b9/how_to_record_1080p_60fps_elgato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1726593-95ec-4c0a-9fa8-201d0f93ad5d/konica_minolta_bizhub_c224e_driver_windows_xp.pdfIn PDF document text
    • http://butorinowu.myartsonline.com/juwalotuladidewininumix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/099189ed-573d-4efd-8816-a6aaef4645a3/learn_english_for_spanish_speakers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865a1f4c-f52c-477e-917e-1c9a14f08c3d/chevy_p30_step_van_specs.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
stream_003_off00010ca1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10CA1 6768 bytes
SHA-256: b64346ae08e3000082c420e22cb454108484254baac3a8e486fece0906d95851
font_00_sfnt_off0000f9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 5504 bytes
SHA-256: dbf974dbdc6f1cc672aa1ec91188e151dec3ff97ba05dfc1a09f1570c3b848e4
font_02_sfnt_off00012085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 11964 bytes
SHA-256: 7bbcd51311c28277d846a398b65689a9b2704956b49e8c793f9e99bedf9bd5e4

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