Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb52f8d16b9c640…

MALICIOUS

PDF

80.5 KB Created: 2021-02-26 21:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: d1835357b934e132a0851f92527ee9ba SHA-1: ce593e9c2c2fff5bc9a9588848fb8688ec8c37cf SHA-256: 3bb52f8d16b9c64013e5ae6accfff4d8e63e866535d044010679e7ae260ac57c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious campaign.

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 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.
  • 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://leonvi.ru/award?keyword=football+drills+using+cones PDF link annotation
    • http://sowopezamiw.medianewsonline.com/why_is_h2so4_a_stronger_acid_than_h2co3.pdfIn PDF document text
    • https://wowaximemufa.weebly.com/uploads/1/3/1/4/131453960/3320640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413474/normal_6037c05c68293.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/are_smart_scales_safe_to_use.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367668/normal_5fe5fddc3f742.pdfIn PDF document text
    • http://hs-life.ru/peaceful_easy_feeling_solo_guitar_lesson_youtubemcpel.pdfIn PDF document text
    • http://my-favshopf.online/wifagimuxixomifavad19ahh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406170/normal_5ff94e8057e71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408483/normal_5ffdb372b3f2a.pdfIn PDF document text
    • http://helplnstagram-confirm.com/jomoxerasapirimekuniqkh51.pdfIn PDF document text
    • http://basiditdcf.space/silulewegxe2yi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446285/normal_60060223911d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_600d5d5f46361.pdfIn PDF document text
    • http://begdas.space/how_to_draw_with_oil_pastels_easy_for_beginnersmwtjo.pdfIn PDF document text
    • http://pravagims.net/89210834249epme7.pdfIn PDF document text
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/fijiwumogememi-romugewokodop.pdfIn PDF document text
    • http://kigurumi.org/70895548496facys.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://japinoxizidunub.myartsonline.com/how_to_replace_trimmer_head_echo_srm-210.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_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 5084 bytes
SHA-256: 88719580efa11dc8e6cfbd993588510ef8f6bd16680f22b3f18ad4cc3c95b995
font_01_sfnt_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 10160 bytes
SHA-256: f7cba418bd0cc75827307e7683408e7d36943a453b2f572b44497839e49483e5
font_02_sfnt_off00012671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12671 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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