Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f413bd3b0cb782…

MALICIOUS

PDF

85.2 KB Created: 2021-03-04 10:32:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d3e8d185e3eea6a1257fbe4fb2befd61 SHA-1: 76e22189db89321b927dd528067075ba74afb4bd SHA-256: 68f413bd3b0cb782c6849b4c5cd66dae27b452a81642632d077d2eaa1d13243d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive URL usage are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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://xezojetit.ru/award?keyword=big+easy+oil+less+turkey+fryer+recipes PDF link annotation
    • https://lakizixobatit.weebly.com/uploads/1/3/4/3/134325667/detuwim.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/aL6jchc/how_to_list_my_apps_on_apple_watch.pdfIn PDF document text
    • https://tupivoxutod.weebly.com/uploads/1/3/4/4/134467409/899bce3bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371812/normal_5fcebdec62fbe.pdfIn PDF document text
    • http://krokoboko3.xyz/cardiorenal_syndrome_coding_guidelinesesrzm.pdfIn PDF document text
    • https://sujumakatu.weebly.com/uploads/1/3/1/3/131379709/2029503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502245/normal_5fdb9e247c476.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/gawebasazupebaxukawatare.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/tewavugutufoderul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369146/normal_5ffa7c5c11961.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/34186162084.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/FujbJig/97428476141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500432/normal_603b53f105c48.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/bead7997.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kimoviranonaf.onlinewebshop.net/rotuzasose.pdfIn PDF document text
    • http://nununad.myartsonline.com/garejexesikenumodexawa.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_off00011142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11142 5400 bytes
SHA-256: 6b6baa26356ede4ff4ce4d2e5a197033859a0cf7a0b2dd1f9b5291497ed52890
font_01_sfnt_off000123c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C9 10372 bytes
SHA-256: d6dcb6916af4acd1f5acd1e0e36a8c51f4e0688faf0d460ec2fd4c2f24bbab10

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