Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8823d46cccd850…

MALICIOUS

PDF

67.6 KB Created: 2021-04-02 15:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1ea62bb8d5aa221bada14692802aa750 SHA-1: 54abad8b9a17f61fc9770b42533889f853588ea9 SHA-256: 7b8823d46cccd850d5f8c8af1b870843e5348c960931a36124db000e7c5de190
186 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/wix?keyword=2004+honda+atv+owners+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484641/normal_5fce9732b5ff4.pdfIn PDF document text
    • http://nibakelenixezas.getenjoyment.net/98888927349.pdfIn PDF document text
    • http://bidetoluji.getenjoyment.net/graphic_novel_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485014/normal_60110b3e9734f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417999/normal_5fff68874cd00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_ebc3b3fd55704237a98f8fc9111e5d84.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89fae4be-cc6e-474e-8144-aa5e27b08638/matrixyl_3000_serum_side_effects.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/easy_rock_drum_sheet_music.pdfIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_a5cdbac9e467400e8c64937a318d0ae2.pdf?index=trueIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_0586f1235cf24dfaa4b4300646c05f74.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_a174398c0b3046a58da364f878f54a4a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7adc1041-b5e0-49fd-9283-6ace77cbe557/apple_iphone_x_sms_tone_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/carving_templates_for_pumpkins.pdfIn PDF document text
    • https://79f67b98-100a-41ac-8a2f-4880133f117e.filesusr.com/ugd/f12c90_6fe767b45afb44ad83b8302fef5cdd42.pdf?index=trueIn PDF document text
    • http://vavadot.onlinewebshop.net/crime_statistics_in_south_africa.pdfIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_733a5a579994481880d4643284f40982.pdf?index=trueIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_b7d0a1d3efe7468399343b71ea94b9d3.pdf?index=trueIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_084a4c046a96465ea9fbf265f3d00035.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b168a3f1-93ef-443c-b63a-3eeb60476b5e/22982883211.pdfIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_3e39df6839424839a257b923c2d8c635.pdf?index=trueIn 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_off0000cca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA3 5484 bytes
SHA-256: de2119fe8ab5da32332b0e2dbe0560a01ad85c523eb32d0d1345b555a672ca43
font_01_sfnt_off0000df33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 9984 bytes
SHA-256: 41220f41193321046a5af985d0993d5c7a61f08b8383935e00ce6c445a6f5a38