Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0191f488d04aedb…

MALICIOUS

PDF

104.2 KB Created: 2021-02-04 06:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 291a9b4461608c94d5c16ba5a8243f1e SHA-1: 09f9eb8cda8799b3e0bd60de998b2c85db23a4e1 SHA-256: c0191f488d04aedb443fa349a4633a42d976b601b69eb513d80969655a80f0d4
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to various websites, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

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://jacksth.ru/aws?utm_term=bach%2527+s+fight+for+freedom+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/wufevinek/gyggjgH/black_friday_sale_online_clothes.pdfIn PDF document text
    • https://likixolokezixi.weebly.com/uploads/1/3/0/7/130738950/gulodaz.pdfIn PDF document text
    • https://cdn.sqhk.co/gopepilexafi/Rhdxgf4/unlimited_free_vpn_betternet.pdfIn PDF document text
    • https://gadakuvinud.weebly.com/uploads/1/3/1/8/131871823/luxixas-puweg-xavur.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/zefutitudajewu.pdfIn PDF document text
    • https://netiwolofud.weebly.com/uploads/1/3/1/4/131438008/3e1be35951fc169.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5fe19e909ac4c.pdfIn PDF document text
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/fawutavi-sumaxiz-totezudezel.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/ujbsgcy/97992167608.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://lisotabisalak.epizy.com/dickies_size_guide_coveralls.pdfIn PDF document text
    • http://satuvet.epizy.com/levers_in_the_human_body_answers.pdfIn PDF document text
    • http://bugudejekizukem.epizy.com/pimugilekokidobe.pdfIn PDF document text
    • http://jiporiri.rf.gd/android_emulator_for_windows_10_nox.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14320 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off00014d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1A 5460 bytes
SHA-256: df90d86fd4562dafcbc96d25fe9fc75a33f93884d7ee7286fba8e8ce33e909f8
font_02_sfnt_off00015fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC2 10492 bytes
SHA-256: 1082c5dbbda23aecfeea39ab6f463df1e5c6defbd8efa9edf4e8675373aa3039
font_03_sfnt_off000182e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182E1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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