Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf54b5ecb60737d6…

MALICIOUS

PDF

75.7 KB Created: 2021-02-20 06:44:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 83209d9f5c15c1e369eeeed9a7fbaf4a SHA-1: 70c0bd7de5e8961d0e0edb8c20fbad9116b57e48 SHA-256: cf54b5ecb60737d6f079473a3e98181dc4b7fe6c1f461e159f91d903f93d4079
274 Risk Score

Malware Insights

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

This PDF file contains numerous links to external resources, many of which are structured as a link farm. One critical heuristic identified a link to a known malicious redirector, and another flagged brand-impersonation for eBay, suggesting a credential phishing or malware distribution attempt. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://bafuvigugasud.weebly.com/uploads/1/3/5/3/135308410/tideputonigisura.pdf.
  • 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://yafferge.ru/strik?utm_term=how+much+money+can+i+make+selling+monat In PDF document text
    • https://bafuvigugasud.weebly.com/uploads/1/3/5/3/135308410/tideputonigisura.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/sX8hfih/fish_hunter_shooting_diary_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/reposivekow/y0igf2p/fruit_cutter_game_download_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388422/normal_5ff0f065a4e58.pdfIn PDF document text
    • https://cdn.sqhk.co/kedezoge/QMBgfgh/notepad_apk_android_2._3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466376/normal_601e82b4dfe16.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/bnmhgwj/21136679707.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451954/normal_5ffa14e31e535.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/gj1hai0/lukeserimeruvumefite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500425/normal_60093b0baf783.pdfIn PDF document text
    • https://zejinimab.weebly.com/uploads/1/3/1/8/131856072/rijomulota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495246/normal_6026e07097cf1.pdfIn PDF document text
    • https://gaxipisida.weebly.com/uploads/1/3/4/2/134267022/maxozabopefogojefifu.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/gy3jejg/puwuvasovimubored.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_600b10d552c30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419441/normal_602fd374dc6b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409818/normal_6000c94817a3b.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/ChjbhaY/hide_hidden_files_mac_sierra.pdfIn PDF document text
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/405108.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/2gjhfmN/cool_popular_ringtones_2020_top_100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 5336 bytes
SHA-256: 8d9eb9677722a60fd5c26824750b55f3d7ad7c4d4c5c8f9192c7d3b408a3fb10
font_01_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 10788 bytes
SHA-256: 5df363ee8deb2fe38918c736a085efd495e3293a2fc3e9fc67bae1aa03401bd2

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