Malicious PDF — malware analysis report

Static analysis result for SHA-256 736841a91f2c1b00…

MALICIOUS

PDF

85.9 KB Created: 2021-04-06 20:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 175105a58399547ab490aba51bc0bfca SHA-1: 11ea4404b83b6342e810000fa3d28b07ec48b55b SHA-256: 736841a91f2c1b003f5eaffa77dc3ead9162bea017918d8a9ebc1559a1811f5c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, indicating a link farm or SEO spamming operation. The primary URL points to a search result for "surface area and volume of shapes pdf", suggesting a lure to attract users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://leonvi.ru/award?keyword=surface+area+and+volume+of+shapes+pdf PDF link annotation
    • http://mosquito.codes/canto_de_pjaros_canarios_campeones7kfwi.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/8243891.pdfIn PDF document text
    • http://didibemez.scienceontheweb.net/coroners_act_1962.pdfIn PDF document text
    • https://geredape.weebly.com/uploads/1/3/4/3/134349068/ce321a40d7110.pdfIn PDF document text
    • https://zenamuvevabun.weebly.com/uploads/1/3/1/4/131453902/185714.pdfIn PDF document text
    • http://bamirajewenexo.medianewsonline.com/48953717514.pdfIn PDF document text
    • http://antonioit.fun/18270872974w2os1.pdfIn PDF document text
    • https://werirubiteda.weebly.com/uploads/1/3/5/9/135972418/ximikogeluroredar.pdfIn PDF document text
    • http://lisolu.org/66044148336j3r9i.pdfIn PDF document text
    • https://lobusejorul.weebly.com/uploads/1/3/5/3/135338183/de3ef66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://safedoguno.onlinewebshop.net/jabewi.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_41d110a9fb454c9a94d9de47a3ba4abd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8964f4b1-d9cb-4183-abc0-414a2a5a42d2/cant_recover_my_fb_account.pdfIn PDF document text
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_e9e416a305f54d2ea2919590e3c44c5e.pdf?index=trueIn PDF document text
    • https://5c126656-fc4f-473b-8c99-11744d2e1b96.filesusr.com/ugd/abd8ec_e6d48da3438745fb90dd628987d4c457.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e950f0-1f2d-494d-bc4e-666f5c3776df/ti-30x_iis_scientific_calculator_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a2a29b6-b558-4f93-aba6-99f717671fbe/dell_precision_m4600_memory_upgrade_instructions.pdfIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_d57147bedea14a14b3e8b6b73da23eb2.pdf?index=trueIn PDF document text
    • http://fajenadiwizowo.atwebpages.com/java_ee_spring_spring_mvc_mybatis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7165bff7-9c43-4ffe-8a7e-42ab5169b396/dibusevenidopositoxuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa09545d-4822-403e-b69b-d3c57c634549/29113563509.pdfIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_7e5e655357b64068a172af64801078c7.pdf?index=trueIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_855faa235108462b97034c08f1781f3f.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 5452 bytes
SHA-256: 1dc82c178240d0899889260f9dee515d3f70e60b77c792b5043e47e8ad51b9cf
font_01_sfnt_off00010f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 5556 bytes
SHA-256: 5c61bf824126147ccf35dcd2d408eafe75fa201175b3982efd3163961a136a48
font_02_sfnt_off000121ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EE 12184 bytes
SHA-256: 1c57f8b7a84ab56a3d382c29a4899620dbf23b36d02483e48eb831021526db37

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