Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2a569c4cee1337…

MALICIOUS

PDF

70.9 KB Created: 2021-01-02 12:03:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5b27147a8fc18d54cbf256d1bf189148 SHA-1: 2b5cc3155267bd0ea2dc991590dedec0a148a1ee SHA-256: 5d2a569c4cee1337afc302aca679b3c57aeef3d60de45cd6055ee847bcc54610
174 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm on disposable hosting, designed to lure users with a fake download button and a browser installation lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the embedded URLs point to potentially malicious or phishing content, and the overall structure suggests a phishing or malware delivery attempt.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://traffnew.ru/aws?utm_term=chrome+for+ubuntu+11.+10+32+bit PDF link annotation
    • https://mitewowepo.weebly.com/uploads/1/3/0/8/130813710/fae98af.pdfIn PDF document text
    • https://gadolelexuzited.weebly.com/uploads/1/3/4/4/134486477/3724017.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/wopuvudagibibilobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459182/normal_5fb88cbe820c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5fb2e415bf948.pdfIn PDF document text
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/8335742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444092/normal_5fbe7aebda0d2.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/53371bd8c510f3.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/fuzejidoziw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5fd7aec565b7a.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/zikeko/rupogevogebiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/945d3892-c707-46e9-ba74-56c826da0407/43153392330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c59c8152-5b0b-4d71-bc7c-fbcfefff60ec/ffxiv_ucob_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/drama_cheer_up_subtitle_indonesia.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_off0000d8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 5152 bytes
SHA-256: 4b1dbc964de52b6e0e9e024de3f72d3a8ed4e73cf44a793cec3cc1735f47bb3e
font_01_sfnt_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 10624 bytes
SHA-256: 9143f2ac36711d1837581fd48023085e0e67652045f904251c1343fc235b72b1

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