Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb23ff51a4f30d79…

MALICIOUS

PDF

79.1 KB Created: 2021-02-20 04:17:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a52f3d1c89893683369e421e2be38e93 SHA-1: 1c628f20cbe83b2698f92822c9aa25959b792c2c SHA-256: cb23ff51a4f30d798e1faf3512d14c551df3c7cf0036bdcc08e4db3f2e296e16
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a significant number of external links, suggesting a link farm for SEO manipulation or to distribute further payloads. The presence of a download button lure further supports a malicious intent to trick users into downloading content. While no scripts were explicitly extracted, the PDF structure and numerous external URLs indicate a potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=sims+freeplay+mod+apk+ios+2020 PDF link annotation
    • http://chambreop.xyz/buzekmj37w.pdfIn PDF document text
    • https://tasoxagizuj.weebly.com/uploads/1/3/4/7/134734804/31f5813a10be.pdfIn PDF document text
    • http://usesoda.pro/jikibagisarelamibozupifaewx4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459188/normal_5ffe0a5ebedaf.pdfIn PDF document text
    • http://wiinorama.space/222609048497j7l9.pdfIn PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/f123063dc88d.pdfIn PDF document text
    • https://jiwefirufij.weebly.com/uploads/1/3/4/3/134370204/limuwafepov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490274/normal_5ff2ac1099ae6.pdfIn PDF document text
    • https://pirebuvix.weebly.com/uploads/1/3/2/7/132710697/141160.pdfIn PDF document text
    • https://kuboteradaragi.weebly.com/uploads/1/3/1/4/131482952/nofikuruxap-togenaxadasok-nudow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_6028021f653c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486192/normal_5fe74ca696cb6.pdfIn PDF document text
    • http://max-lifting.store/buvagewinumozilegelxxrtf.pdfIn PDF document text
    • https://reseviris.weebly.com/uploads/1/3/5/4/135400779/02092f399878.pdfIn PDF document text
    • http://help-ruleviolation.com/how_to_create_a_youtube_gaming_logowp8qt.pdfIn PDF document text
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/7458018.pdfIn PDF document text
    • https://besusawoses.weebly.com/uploads/1/3/5/3/135318815/bexolezusitir-lemupiluboxawo-winop.pdfIn PDF document text
    • http://widalatipuna.22web.org/sutozafexuxu.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/rizezobabub/pevijofor.pdfIn PDF document text
    • http://tubonunok.epizy.com/second_grade_math_assessment_printable.pdfIn PDF document text
    • http://tivapatovike.epizy.com/82309949546.pdfIn PDF document text
    • http://woloripovopakop.rf.gd/27402805727.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_off0000f48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 5732 bytes
SHA-256: 33f8a203c6acc48d8dedd93a179e7db7e767f904c384dd3ca8e862fbdb00c4a7
font_01_sfnt_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 11016 bytes
SHA-256: fb7174902e1b29bdc935d8b7b7ad9d0c13cca8a7e037ff8918e5e372dbaf8c42