Malicious PDF — malware analysis report

Static analysis result for SHA-256 439c4ae53b1da359…

MALICIOUS

PDF

66.1 KB Created: 2021-02-18 00:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 13cb110407e623343e0e7caf1ac288fa SHA-1: 29de1e0d3840d2a397314b03edd69982e8b5da15 SHA-256: 439c4ae53b1da3590eefed9fafbff6d13855226ad244dbcca75c1cda72d63bcc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a malicious distribution or phishing attempt. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure to external malicious sites.

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://baarspo.ru/123?utm_term=the+practice+rooms+cotham+hill+bristol PDF link annotation
    • https://wufunuxiropid.weebly.com/uploads/1/3/2/7/132712508/5913973.pdfIn PDF document text
    • https://cdn.sqhk.co/tuteremekome/CNjd6hc/canvas_parent_account_creation.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/Ijj1wgc/60725474330.pdfIn PDF document text
    • https://kuludiliwalu.weebly.com/uploads/1/3/4/4/134484861/8124264.pdfIn PDF document text
    • http://kuxogajow.iblogger.org/20978696374.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/arbeitsvertrag_kndigung_muster.pdfIn PDF document text
    • https://wubepifumemav.weebly.com/uploads/1/3/4/1/134109226/77725.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/siec4gg/download_game_monster_truck_destruction_mod.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/explorelearning_gizmos_answer_key3sqvs.pdfIn PDF document text
    • https://cdn.sqhk.co/jesarijufe/BDKjeje/primalert_10_monitor.pdfIn PDF document text
    • https://cdn.sqhk.co/razanifuwuz/fieoEvg/81717360605.pdfIn PDF document text
    • https://cdn.sqhk.co/nilulugaj/TOjkifr/matrixyl_synthe_6_serum.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/EgdGGp5/zinutopenufomifumukawipaj.pdfIn PDF document text
    • https://cdn.sqhk.co/gojelonub/kgehije/generations_the_legacy_2020_cast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://redepulevinevux.epizy.com/printable_paper_bag_puppet_templates.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_off0000c65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65D 5260 bytes
SHA-256: b02054f40859106fb923ab9bd5efbe3176a72b91386f596aeec766c4f7c1dc57
font_01_sfnt_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 10492 bytes
SHA-256: 368f64ae519117d2d49c61818b9ee739ed9bc474ff4a0b660b2301ca3a16a7f4

Open this report in the interactive analyzer, or submit your own file for analysis.