Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b837a7cb238512…

MALICIOUS

PDF

72.9 KB Created: 2021-06-07 14:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 023ff1636c7a311a27886b5ebceaf585 SHA-1: d058b0219f48ba70b35470df31cdbec0818cc84f SHA-256: 68b837a7cb238512443bbd25ce2bc7a8d64a171f2c60147eda91b7a11996c1ca
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a common tactic for SEO manipulation and potentially phishing. One of the extracted URLs, https://inwebjor.ru/pbw?utm_term=how+to+hack+dice+in+ludo+star+2, is flagged as unknown reputation and is part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://inwebjor.ru/pbw?utm_term=how+to+hack+dice+in+ludo+star+2 PDF link annotation
    • https://fomutifimo.weebly.com/uploads/1/3/4/5/134594787/2306567.pdfIn PDF document text
    • https://putojedenavaxo.weebly.com/uploads/1/3/2/6/132683165/ece89205583b6ab.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/1930269.pdfIn PDF document text
    • https://fafutetigav.weebly.com/uploads/1/3/0/7/130775448/8b8c5.pdfIn PDF document text
    • https://banuvexizuji.weebly.com/uploads/1/3/4/3/134387765/fudilifazefuduvexo.pdfIn PDF document text
    • https://zajoxewamabovi.weebly.com/uploads/1/3/7/5/137503144/5740741.pdfIn PDF document text
    • https://nenopejir.weebly.com/uploads/1/3/4/6/134603535/e752d3d1ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tufukamapaf.pbworks.com/w/file/fetch/144514371/inverse_functions_and_relations_worksheet_answers.pdfIn PDF document text
    • http://fisukafetif.pbworks.com/f/santa_muerte_tarot_guide_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c980476-83b6-4e45-a008-8e2e9fe01bdd/2020_ford_mustang_premium_convertible_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd3f2126-fe25-458f-a59a-23c5c09a0104/58965065794.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/8019811217.pdfIn PDF document text
    • http://tewabavuxate.pbworks.com/w/file/fetch/144780675/how_to_become_a_medical_sales_rep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad823a39-a651-4c57-a9be-57175d7b18d4/ditojoreduko.pdfIn PDF document text
    • http://felefejimax.pbworks.com/f/what_is_a_sputum_culture_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/002b21a3-8b7a-4d6f-86b4-795e7099b777/wadubezofater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f03bac-98f4-4471-8dba-79533c5d06d9/towers_of_high_sorcery_download.pdfIn PDF document text
    • http://ridelox.pbworks.com/w/file/fetch/144778488/positivist_approach_to_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38bd46ff-fcc9-4f63-95e7-ca329eb06dc9/new_testament_institute_teacher_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbbb9245-a958-4f9c-8141-61ca3208c72b/50396009185.pdfIn PDF document text
    • http://ronefete.pbworks.com/f/the_useful_knots_book.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/f/9315466734.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_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 5276 bytes
SHA-256: 32a8693274df3c04458c90a77a2ede5f0e6635ffa9375b29911d92767fe6eb90
font_01_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 10896 bytes
SHA-256: f9e4f221cb8769bfd0d9fc07f2e63ec75116b0839761d2bb6c30da772235b8c5