Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af223c082a5f089…

MALICIOUS

PDF

78.1 KB Created: 2021-03-12 05:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4565f6ac8f02cdb15eaf7aee1d93dd83 SHA-1: b4f9628afc669d79cd657fbf565b5c0be26202e9 SHA-256: 6af223c082a5f0890bff6377288c13996163997cc38b2fbee50e846ac20d24fd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with `https://botokaw.ru/wix?keyword=building+and+export+to+excel+spreadsheet+c%2523` and `http://arboozfilm.com/74726126844fh9cs.pdf` being prominent examples of potentially malicious destinations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable domains, a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://botokaw.ru/wix?keyword=building+and+export+to+excel+spreadsheet+c%2523 PDF link annotation
    • http://arboozfilm.com/74726126844fh9cs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462056/normal_601f879d44c7d.pdfIn PDF document text
    • https://cdn.sqhk.co/nepelusir/ieEijih/petrochemical_engineering_companies.pdfIn PDF document text
    • http://scandisvet.ru/what_is_the_role_of_a_criminal_defense_attorneygmn62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420765/normal_60330002d1e37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455396/normal_600fea9e54216.pdfIn PDF document text
    • http://reduslim-ufficialesito.site/fst_7_big_and_ripped_diet1xxzb.pdfIn PDF document text
    • https://cdn.sqhk.co/rukeditele/jf1Tje4/ejen_ali_emergency_mod_apk_new_version.pdfIn PDF document text
    • http://usmileofficial.site/aha_guidelines_cabg_2015guqf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406497/normal_6012978283b2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463263/normal_602fc44f0842e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464532/normal_602dd7b57870c.pdfIn PDF document text
    • http://artistichomesolutions.com/chameleon_evolution_gamebijcs.pdfIn 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/687c85f2-9a86-4cba-ab6b-d85a812ec8f1/memaribixifekapaburepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77b62a16-a4e9-47b0-bb57-ea1fc2a689b8/56018709313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd2d00c-d9e3-4426-a4b0-7fb23e6a4a69/frigidaire_front_load_washer_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1fa0a11-3bf5-41dc-89c1-480a1f873138/kobitefirevibudaken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d873b80b-be8b-4add-882c-5c8ea20de6ba/pre_reading_strategies_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48772da7-5d9c-464b-8e5e-07e83d34698a/cost_of_washer_bearing_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d41ff19e-62d3-4b7f-9991-a282a5ad0d02/how_do_you_clean_a_honeywell_electronic_air_cleaner_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5fa1b5b-09cd-420e-8f86-7fc9a21ed478/how_to_have_power_and_confidence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f1c20c4-6620-4d6c-a3aa-2d1e47518a71/91561889730.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_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 5452 bytes
SHA-256: bc39e7de09704dd55ade28bcd7488393c9ecd524a6498b47e1ff88a7c487bd4e
font_01_sfnt_off0001087a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 10080 bytes
SHA-256: 505c58376aaf3b2cacf049d1424355b08ec37ccb995f6a12f7618f2ff48b555c