Malicious PDF — malware analysis report

Static analysis result for SHA-256 946b9c46dc624d83…

MALICIOUS

PDF

76.3 KB Created: 2021-06-05 10:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fa89f62eab1461b289277d4272472aeb SHA-1: b0742d11953d7fe2330789c3540268d922db1e3f SHA-256: 946b9c46dc624d83491441386720e4c0ced573273d940b24d8be0d8da0eca995
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-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.
  • 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://philabc.ru/pbw?utm_term=stc+1000+manual+francais+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485166/normal_60128b749e200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454670/normal_5fdc4afbce322.pdfIn PDF document text
    • https://pojasulexubu.weebly.com/uploads/1/3/5/9/135993084/tovidone_giruvumodibaris_gerutifugiwu.pdfIn PDF document text
    • https://galexoraka.weebly.com/uploads/1/3/4/5/134524836/rikidebezofiwasosi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://polubisoxuwo.pbworks.com/w/file/fetch/144493161/marvel_contest_of_champions_premium_hero_crystal_trick.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/w/file/fetch/144463641/is_wrist_blood_pressure_monitors_accurate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad9562cb-1569-42aa-9163-19df4e5c70b8/2006_honda_civic_lx_repair_manual.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/w/file/fetch/144463680/dufogetunifije.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/w/file/fetch/144529992/nafokejiripuwesiri.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144521223/fifa_16_mod_fifa_21_apkobbdata_offline_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f20acf4-e587-4612-a5b7-2c18f30d6550/how_to_meal_plan_for_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79bf5924-b004-4fc2-9972-a69243255d1d/does_cricut_expression_have_bluetooth.pdfIn PDF document text
    • http://zikasamu.pbworks.com/w/file/fetch/144466899/cutting_edge_intermediate_teachers_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99af966c-88a1-4be0-a981-c63b54cdb2c8/2018_subaru_forester_manual_transmission_problems.pdfIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144584184/un_secret_philippe_grimbert_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b40c0dbc-026c-4990-9022-c162a6b4a280/lopaje.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_off0000e8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 5596 bytes
SHA-256: 6a79dc0b31ee5b50ea294594b64df8d794ac72715c248cf4f8a486079d9965ee
font_01_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 12212 bytes
SHA-256: da899e83c859336689d65a6c753545f0c0df30e5f571645e217c5cf22887ceb5