Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf984a351737dd78…

MALICIOUS

PDF

74.1 KB Created: 2021-01-12 12:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2b6c70e5e4fd3084bdd538db2fe55120 SHA-1: bd3b326224a51a0f2a24dac07d8ee3957e0ec476 SHA-256: bf984a351737dd78cf06a014854a1cb3b042cec79d8463cf80d4a81ca15722fd
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm designed to redirect users to potentially harmful content. The presence of numerous external links, including one pointing to 'ccleaner_pro_apk_cracked', suggests a lure for software piracy or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, likely for SEO manipulation or to host malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/aws?utm_term=ccleaner+pro+apk+cracked PDF link annotation
    • https://xexezakofiwojuv.weebly.com/uploads/1/3/4/3/134372147/volixipaz.pdfIn PDF document text
    • https://duketexu.weebly.com/uploads/1/3/4/7/134725944/8687981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_5fa38d4b708ca.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/218b302b222536.pdfIn PDF document text
    • https://cdn.sqhk.co/poxofufiko/aaV2gcj/bubble_pop_toys_and_me_free_download.pdfIn PDF document text
    • https://tiluzapibijodok.weebly.com/uploads/1/3/4/2/134265907/2882a6f281b96.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/bapujim.pdfIn PDF document text
    • https://repugololenip.weebly.com/uploads/1/3/4/8/134880500/3461cf.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/jEhgLPJ/fun_minigames_minecraft_pe.pdfIn PDF document text
    • https://vedudogekikusiw.weebly.com/uploads/1/3/1/1/131164168/bejaboreduz.pdfIn PDF document text
    • https://xeludopoveju.weebly.com/uploads/1/3/4/5/134528604/gasimiwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f89cd3dcf256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_5fb2cba43777d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_5f9ee908a128a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463554/normal_5fb2f27e42de1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/gestalt_approach_to_problem_solving.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/falcon_f16v2_manual.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_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 4860 bytes
SHA-256: 6d88a43d6d87e76c3a95b11c96caa6be8040576152732bb398d238e8fc094cc5
font_01_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 10492 bytes
SHA-256: 6d490545933a075c354852f69783f2127a4d098eb9103bf0e2acd88acfc257b2

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