Malicious PDF — malware analysis report

Static analysis result for SHA-256 a134b7606a0485b7…

MALICIOUS

PDF

73.9 KB Created: 2021-06-02 10:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8e4db100ba666f52410d61fb769a9d7a SHA-1: 80e1c9c2794058503033108514c2f0c9f0fff7cc SHA-256: a134b7606a0485b7113c7a7294bc084ed75317d04132c7eea3f0b4c733f57c3c
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, suggesting a link farm designed to direct users to potentially malicious or SEO-manipulated content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://smidgel.ru/pbw?utm_term=is+adobe+x+pro+compatible+with+windows+10 PDF link annotation
    • https://zigikarorusoto.weebly.com/uploads/1/3/5/3/135351373/4680292.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406812/normal_5fe4d24dd79aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479236/normal_5fec7b95e2da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470228/normal_6039ac3d35f23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475406/normal_6017625449f35.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/ketolenaxugalo.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4377679/normal_60b5ba7eb02d7.pdfIn PDF document text
    • https://jibuzuku.weebly.com/uploads/1/3/0/7/130739289/6145179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404490/normal_60619afe817ca.pdfIn PDF document text
    • https://vutizimowunofe.weebly.com/uploads/1/3/4/3/134354130/6305745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464534/normal_5ffa180075955.pdfIn PDF document text
    • https://pekizexigobuton.weebly.com/uploads/1/3/0/8/130815014/6effd00100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450152/normal_5fe982459da47.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pefagisunel.pbworks.com/f/what_are_the_merits_and_demerits_of_parliamentary_system_of_government.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd57dff-7346-483b-8efb-9d5def5250de/ikea_malm_bed_parts_uk.pdfIn PDF document text
    • http://sujagajo.pbworks.com/w/file/fetch/144487701/85012148234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bf61b9f-1952-4a16-93eb-296f16a5020e/toro_lawn_mower_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc29c9c2-f599-48ab-bef5-3ceb28cbf7c0/dewalt_1_2_in._titanium_pilot_point_drill_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/923fdb39-f53c-4679-8a5e-19d6b3f8b404/timawusedefunuvotilaliz.pdfIn PDF document text
    • http://veweran.pbworks.com/w/file/fetch/144432660/how_to_beat_the_egg_drop_challenge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1adaaeb3-2c1f-4fda-971c-0355c0373567/gre_general_test_verbal_reasoning_practice.pdfIn PDF document text
    • http://wusagem.pbworks.com/w/file/fetch/144474252/free_full_hd_movies_on_youtube_list.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_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 5744 bytes
SHA-256: eb94fe0c979b1e03e4edcdaa85c1e2bad5ad527b024078ce52d4481541b5439d
font_01_sfnt_off0000f608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF608 10580 bytes
SHA-256: b9d00932507410ad850932a213d39288f4e5d1dcd42f27364622e08cca2fc4ec