Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1c285185649c2a…

MALICIOUS

PDF

63.3 KB Created: 2020-12-21 21:11:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 40481070b7b7e21fc17ae300ff981171 SHA-1: 737084cd2d0c8b4535b690008a281be3db51e631 SHA-256: 8b1c285185649c2a2c8bf14c02d9151bc774b4392c0f33c423e0f65f1800de79
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body and embedded URLs indicate an attempt to trick users into downloading a "hacked apk" file, likely a trojan. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/strik?utm_term=superstar+band+manager+hacked+apk PDF link annotation
    • https://fenulibamale.weebly.com/uploads/1/3/4/6/134601409/napumevutibet-modotujigi-tetojawer-dozivexetun.pdfIn PDF document text
    • https://rivatekat.weebly.com/uploads/1/3/4/6/134626126/3799c.pdfIn PDF document text
    • https://xurigaguk.weebly.com/uploads/1/3/4/6/134635426/12ad3ef93b.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/telopubujixamivope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391909/normal_5fc73f2338750.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477401/normal_5fc95c7d754bc.pdfIn PDF document text
    • https://xezepumufemab.weebly.com/uploads/1/3/4/5/134589658/1579014.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/5810724.pdfIn PDF document text
    • https://nupadosizekibu.weebly.com/uploads/1/3/4/5/134597568/gaxasowilotobu_moxonelatideb_fuzexuj_zutozenajinedu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5068eaf37e3b64926566/1606373483065/76725006164.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_off0000b967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB967 5760 bytes
SHA-256: 577b3d7c914384cda283a470bb1be55c55d3d3966408f521e22ba84b0ee59ce7
font_01_sfnt_off0000ccd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 10412 bytes
SHA-256: c65bce04c26a09064ee28d86fbb9467f8a57304ce31ea0435039438a578a1efd

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