Malicious PDF — malware analysis report

Static analysis result for SHA-256 a761119a721dad7c…

MALICIOUS

PDF

77.3 KB Created: 2021-03-27 14:24:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47ad66b55bfd61a49f848fed442e94cf SHA-1: 83adebaa570e8cfd02fcdf6c84162f5a52475a4d SHA-256: a761119a721dad7cb9e166007d45717ea70805d3e5af580ee7e880aa869f9b05
156 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and a heuristic firing for a PDF link farm, indicating an attempt to redirect users to malicious sites. The document body, though partially corrupted, suggests a lure related to installing a DirectTV player. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=how+to+install+directv+player
    • http://fituxem.sportsontheweb.net/autumn_leaves_jazz_piano_tutorial_swing.pdf
    • https://cdn.sqhk.co/wolebiduju/rghJSie/photo_lock_screen_apps.pdf
    • http://xolokukifimiv.sportsontheweb.net/zadijura.pdf
    • https://cdn.sqhk.co/vapelomusanu/jbichjx/78530653095.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tazibabebamep/55873308337.pdf
    • https://s3.amazonaws.com/zufaxepixiguxax/sufapiboro.pdf
    • http://solejow.myartsonline.com/65068935760.pdf
    • https://s3.amazonaws.com/jesidofefe/nalolexipoxekiw.pdf
    • https://s3.amazonaws.com/vapelurowar/annihilation_imdb_parents_guide.pdf
    • https://s3.amazonaws.com/rubidokezive/satuxosoputowuwanufepuzaw.pdf
    • https://uploads.strikinglycdn.com/files/7a7f5201-08f7-4cc7-9ac6-dc49cbbd0704/apc_smart_ups_700_battery_replacement.pdf
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_54413d1af5a9450eb9d564da89ff4a4a.pdf?index=true
    • https://s3.amazonaws.com/purufiz/kiss_the_rain_flute_sheet_music_easy.pdf
    • https://4bf2f01b-ac99-4d11-b4a4-7adee35df590.filesusr.com/ugd/868b90_30371a7388fd4f27acfba78e8668dfd9.pdf?index=true
    • https://73808e0e-d5df-4584-b63e-1552d949bc0c.filesusr.com/ugd/8d2ea6_e7597c81a8134473ae4e39156aaadd11.pdf?index=true
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_1e0c99cb37274eaa8e21262378fabd62.pdf?index=true
    • https://s3.amazonaws.com/kimone/what_is_the_formula_for_quarterly_compound_interest.pdf
    • https://uploads.strikinglycdn.com/files/c50d43c9-f72d-419f-8a50-12660e537d08/5309917570.pdf
    • https://uploads.strikinglycdn.com/files/1e21b65f-f153-45f2-b942-2ac7c0d15f9d/club_car_carryall_service_manual.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f016.bin
3785f6d0fa271774562d52a82b2cd5840e414642b34e086e9a58db3db78e9368		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 5284 bytes
font_01_sfnt_off00010238.bin
e87cb09f102652a543feaac5a617aa67cb599f85fe46f4c4f99ab54066d3c0b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 11116 bytes

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