Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bd662549b68db8…

MALICIOUS

PDF

78.9 KB Created: 2021-02-21 23:27:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6f86c04c3510956ae28c05c8f3846198 SHA-1: d11ed060db3ea9a10511c10a131135ead22389cc SHA-256: 38bd662549b68db8f47259093e45736473b2c9a1265a749ea8c2c41000daaefc
264 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the PDF structure itself is used to host and present these malicious links, likely as part of a phishing campaign or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://crophysi.ru/123?utm_term=stand+up+india+meaning+in+tamil In PDF document text
    • https://cdn.sqhk.co/gabixeme/rChgcge/prince_sultan_armed_forces_hospital_madinah_email_address.pdfIn PDF document text
    • http://justiciaforjustice.com/jefawazerojiir7vj.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/iaAAkz6/data_monitor_simple_net-_meter_premium_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/zthhKAy/sumegak.pdfIn PDF document text
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/9047772.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/zeboxi-famil.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/VaFjiHH/modern_warfare_warzone_pc.pdfIn PDF document text
    • http://deine-gabe.com/are_android_phones_linux_basedqlkxf.pdfIn PDF document text
    • https://vatilevemuwaji.weebly.com/uploads/1/3/1/4/131453872/poxijinolago_tevilute.pdfIn PDF document text
    • http://lngcliente.com/game_hay_cho_android_tiviwglt4.pdfIn PDF document text
    • https://cdn.sqhk.co/jebumujo/Xjiifg1/fofide.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/bhbEjdq/rope_frog_ninja_hero_gangstar_vegas_mod_apk.pdfIn PDF document text
    • http://mushygushysayings.com/kefagewijmvuk.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/nedijowewoded/84725117165.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/76886671180.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/enduring_power_of_attorney_bc_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/chamelephon_apk_5._1._1.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/story_writing_worksheets_for_grade_2.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_off0000f530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 5108 bytes
SHA-256: c3f10ab0e9c310ed51b2afe8b87b91adb988c2978e28dd7f81c31714a0a99c8a
font_01_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 11908 bytes
SHA-256: 982ea90974043084a2cfc872748fc21e1411e47e73b72e0f0de4bc09e9abed78

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