Malicious PDF — malware analysis report

Static analysis result for SHA-256 f598c37df19b5e9f…

MALICIOUS

PDF

85.2 KB Created: 2021-03-22 22:04:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec90b02e3b809ef1c1a1ce0138ebc6c0 SHA-1: 77060fa41ba9d892fef099a06c0771908e212827 SHA-256: f598c37df19b5e9f4d715464d17620ae9825cd5669f428b1f9887de2e1ca4011
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF link farm, suggesting a malicious intent to redirect users to potentially harmful websites. ClamAV and ML classifiers confirm this, flagging it as phishing and malicious. The presence of embedded URLs and the nature of the link farm indicate a tactic to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=derechos+humanos+definicion+real+academia+espa%25C3%25B1ola
    • https://cdn.sqhk.co/genopeno/iiaOhel/lobiketelunujenufivodo.pdf
    • https://cdn.sqhk.co/ruduligived/Qifibhb/cover_orange_2_8-_20.pdf
    • https://cdn.sqhk.co/kanemili/gAlhigj/rise_up_bakery_greenfield_ma.pdf
    • https://cdn.sqhk.co/tutabalero/g7Ghhgd/47661199749.pdf
    • https://cdn.sqhk.co/nugofonavuf/sd9jicO/97211485426.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_5ab9da03e1574e0bb2c1158467f2b844.pdf?index=true
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_f22018268b2245328d6461455472f279.pdf?index=true
    • http://zumijuxuv.epizy.com/importance_of_globalization_in_education.pdf
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_e8a6496b686d432a97713d68c8904ee5.pdf?index=true
    • https://692937ca-140d-46b9-9715-018e108c1018.filesusr.com/ugd/2540a5_dfb5602741cd476bada8fa9c6552e84e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c03468be-a329-4bf1-bee1-1db58ed2482c/tipobetirexozifapovenubu.pdf
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_acd6f8b741824e69bec22b024214a29a.pdf?index=true
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_9cc2f1da273546a79fa1bda8d906b653.pdf?index=true
    • https://uploads.strikinglycdn.com/files/002c512d-86a9-48a8-b825-eeb22b887223/feta_pasta_trend.pdf
    • https://uploads.strikinglycdn.com/files/8805074d-d0e4-403a-b784-6fe1990abc54/rajodubutodexiwamepi.pdf
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_9e9f10c6cd4f44c291017c09bd223d93.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7d20a2a5-6a93-419d-b128-e55cce8fcf25/15728288259.pdf
    • http://lusuvurulap.epizy.com/sifowusajozumukewo.pdf
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_cd051fe8f11d4398b05cff5a20ddcb28.pdf?index=true
    • https://uploads.strikinglycdn.com/files/50949a6c-2809-4575-87ad-bb622e552ec6/why_does_my_hp_printer_keep_saying_paper_jam.pdf
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_a8b23a2e70af48adbe55ed331c1c5627.pdf?index=true
    • http://fapibudu.epizy.com/bekhayali_song_official_video.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a5a.bin
13119d04664dfa6aa30131ce3fec03a774efd97fb923275307ea85fb66ee7617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5A 5604 bytes
font_01_sfnt_off00011cfd.bin
0ceddcfb74ef1959490bd9428a2a4e3e14d0df23e9db5d9b6fa79fd3e7adbbdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 12576 bytes

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