Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e83542460025bd0…

MALICIOUS

PDF

73.8 KB Created: 2021-02-11 19:15:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4025372dd34b92c77d8de9f5b0eab977 SHA-1: 60351bf8041decb35f0b69e69396f1a3f81fa78f SHA-256: 3e83542460025bd070b82434454d76cdce8383af674a42d07aa92253bdd1f9da
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, suggesting it is part of a link farm or used for phishing, with one URL specifically mentioning "Washington emissions testing" as a lure. No scripts were extracted, but the presence of numerous external links indicates a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wix?keyword=washington+emissions+testing PDF link annotation
    • https://cdn.sqhk.co/xovikojux/jgLifzR/cosmos_possible_worlds_episodes_fox.pdfIn PDF document text
    • http://deflecfcvy.best/base_smart_home_systemsjkws5.pdfIn PDF document text
    • http://sberin.xyz/karuppasamy_kuthagaikarar_audio_song_freelj8vj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387224/normal_5fd8d47724b3c.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/75kgj1F/warriors_of_kingdom_revenge_fight_mod.pdfIn PDF document text
    • https://sefomaxezaniv.weebly.com/uploads/1/3/1/4/131483109/tupexed.pdfIn PDF document text
    • http://nuveclovet.xyz/25779950029l3d4m.pdfIn PDF document text
    • https://cdn.sqhk.co/pibexezases/ijUgdlU/64004888359.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466657/normal_5ffe1402aebfd.pdfIn PDF document text
    • https://totaduwuvib.weebly.com/uploads/1/3/0/9/130969262/5372265.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/wfrp_character_sheetacw45.pdfIn PDF document text
    • https://cdn.sqhk.co/bipokagiti/aiiizus/beat_racer_mod_apk_2._4._1_download.pdfIn PDF document text
    • http://mkr-olimp.info/71802961704wgzsn.pdfIn PDF document text
    • http://shop-profildoors.ru/carnatic_music_lessons_book6ojjy.pdfIn PDF document text
    • http://uaportal.site/portable_infix_pro_editor_v4.25vzmfm.pdfIn PDF document text
    • http://excschool.ru/stardew_valley_first_spring_guidei1we8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403531/normal_5fc763d013466.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/kuijYjd/concise_physics_class_9_solutions_chapter_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5ff50e56f3ee5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445745/normal_5fcfb32187cd2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
font_00_sfnt_off0000d82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82C 4772 bytes
SHA-256: aa97d120ee08ba8c08dd0faaa059d8a913cb13ccb8b70bb22ff7313dbf70e4f8
font_01_sfnt_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 10360 bytes
SHA-256: 18160553a3406f457559a7250bdecc40534a87564154a626438b42de09868919
font_02_sfnt_off00010b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34