Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba5d99829e616ec…

MALICIOUS

PDF

86.7 KB Created: 2021-02-12 16:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2b1bbe55092f53f72ebb91295b423933 SHA-1: f06cbd11664de2245b65ecbd218c413cc27a11b8 SHA-256: 4ba5d99829e616ec217d8c0fe995296d9682b0fb5f2e5192c89fe20c1ebad5d1
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically pointing to 'seumenha.ru' and a keyword related to TV guides. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple PDF links, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://seumenha.ru/wb?keyword=tv%20guide%20sky%20sports%20f1 PDF link annotation
    • http://unonatur.space/ottoman_empire_conquered_spain6xoqm.pdfIn PDF document text
    • https://jomaredavox.weebly.com/uploads/1/3/2/3/132302995/vironaxupimi.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/lilinidenogcrti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493890/normal_5ff8bb13be4f0.pdfIn PDF document text
    • https://jalesebexiw.weebly.com/uploads/1/3/0/7/130739560/zefawajixowokil.pdfIn PDF document text
    • https://dipakinujudisil.weebly.com/uploads/1/3/4/4/134468351/c8d9d11eca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450047/normal_5fff6f1567928.pdfIn PDF document text
    • http://khareedforosh.com/xuvizurotivoxegotimiwet6iwkz.pdfIn PDF document text
    • http://freshnatur.fun/96236243048vy7fy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420019/normal_5fe5fbc8668b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_600f20864fdf3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://boxokur.epizy.com/tikeredi.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/90931337178.pdfIn PDF document text
    • http://vobisobopimab.epizy.com/ciencias_formales_y_facticas_ipc.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/2001_maniacs_full_movie_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/ff14_fashion_report_100_reward.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/64326672532.pdfIn PDF document text
    • http://xojorefalez.rf.gd/nemadiz.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/certificate_of_good_standing_request_form_delaware.pdfIn PDF document text
    • http://vilusosexar.epizy.com/irritable_bowel_syndrome_diarrhea_treatment_guidelines.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10987 4972 bytes
SHA-256: 418935d389c36ccac0229f7d7b7f8d6a48b690db8c2020ff9f23cfe0230228cb
font_01_sfnt_off00011aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAA 10636 bytes
SHA-256: f4ead1753d5925958e4feeee2b6df60877f3b075dccdea8adebf663ef461362b
font_02_sfnt_off00013f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F34 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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