Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb34d23b41ec5bd4…

MALICIOUS

PDF

73.2 KB Created: 2021-03-19 22:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2216c6d43267ec81be3d5f31713c37ea SHA-1: 68caae37e4e7937fc5bd5460cd2dc8464e942eae SHA-256: eb34d23b41ec5bd411ff2db8a83ec34a39068468349883a34497b8bbb9a5ea7d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://kuzutuzo.ru/wix?keyword=cougar+run+elementary+staff PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469852/normal_605479ef49024.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/gCLicgU/wedding_salon_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479921/normal_5fffea216af96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408333/normal_6004ad3a5f64a.pdfIn PDF document text
    • http://polafozu.iblogger.org/difodatodudomubede.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzojivemepe/75bZjcj/appreciation_event_invitation_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389816/normal_5fe0ca9743dae.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxiniraz/xicijol/93990583033.pdfIn PDF document text
    • https://jutijodofolumel.weebly.com/uploads/1/3/4/0/134012985/nojilabexelidisin.pdfIn PDF document text
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/vimolakixuzas.pdfIn PDF document text
    • https://cdn.sqhk.co/videbamez/hehajdN/furegafewakivozas.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/ZDggKPg/87360194982.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/ksjaO2H/meludati.pdfIn PDF document text
    • https://cdn.sqhk.co/mebereserab/rhcqkhd/dream_about_my_girlfriend_talking_to_another_guy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412403/normal_60192f769fac9.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/Hhyhjb1/belozuzisasebizebuwedam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bopenakonaj.rf.gd/cosmoline_sds_sheets.pdfIn PDF document text
    • http://vulitogegitutop.rf.gd/8972671336.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF7 5048 bytes
SHA-256: ee0891c6ec30eed37b196f82c4716c2bf6738a5a05cc52c716de11022cc58108
font_01_sfnt_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 12840 bytes
SHA-256: d326e0f197d18bcc4132575a9055dbb4e35e6302857ef3663e183b7fb6647ccc
font_02_sfnt_off0001082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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