Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5af045901e14a3…

MALICIOUS

PDF

72.5 KB Created: 2021-02-18 21:22:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 83d5c2581b1055bfa7dd1980c44e9967 SHA-1: 90db75631a3a818f907ea5dafea1f27bcac6bbd9 SHA-256: 5f5af045901e14a38268bec6638eebbe5fc385490f9a8bf0987c3ce392179b94
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://seumenha.ru/strik?utm_term=is+aerospace+engineering+in+high+demand PDF link annotation
    • https://cdn.sqhk.co/wepunajexiju/jeYyicj/real_car_parking_games_online_play.pdfIn PDF document text
    • https://cdn.sqhk.co/jedepazisu/igYZHa8/metaphysics_definition_meaning_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/xidafigutoxa/ejcjfkq/how_to_do_ski_jumps_workout.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/pNzhjiG/lost_lands_a_hidden_object_adventure_cheats_solution.pdfIn PDF document text
    • https://motawifuliwax.weebly.com/uploads/1/3/3/9/133999363/2ef88be00e3966.pdfIn PDF document text
    • https://kemebawe.weebly.com/uploads/1/3/5/3/135313751/1941951.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bogeguva/zuguz.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/octavia_butler_bloodchild_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/dutoxijajuwe.pdfIn PDF document text
    • http://kewetevidelumuz.epizy.com/free_greeting_card_mockup_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/55817696122.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/duruzafipamozozadiwo.pdfIn PDF document text
    • http://fapugiv.rf.gd/webumijesali.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/functional_plant_ecology.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/surumuxetif.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/personal_pronouns_worksheet_for_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/zamef.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/identifying_minerals_by_properties_worksheet_answers.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_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 5392 bytes
SHA-256: 20fed67546debe1cbacaf8ae266a68d69784ac35f441ca9e11df6fc6e730f59f
font_01_sfnt_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 10736 bytes
SHA-256: a1f390bc67cc7890c1a96ed46673255528b1ef4c2cadecb0465eb91e260e3168

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