Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e164b4a6a85632…

MALICIOUS

PDF

83.3 KB Created: 2021-05-09 02:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1fa89feb9da77e85a39a4890c40030dc SHA-1: 7e0fff9f0f73ecc0170f1539940c8b83911fb190 SHA-256: 82e164b4a6a856320aea6c736179446b404618a1658f94074718c4715c9e0856
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 pointing to disposable hosting services, indicating a link farm designed to distribute traffic or host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=world+war+z+movie+online+with+english+subtitles PDF link annotation
    • https://tumugisoluxadez.weebly.com/uploads/1/3/4/6/134601474/rejekitim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454306/normal_60600709237de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412377/normal_6052f385ebaba.pdfIn PDF document text
    • https://rokumetusemep.weebly.com/uploads/1/3/4/3/134382705/xeruxitajuxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365547/normal_5fff444930893.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468268/normal_5ffb58fb14154.pdfIn PDF document text
    • http://jewuzalozegeso.iblogger.org/13472216719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450160/normal_6036c13ea406f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389355/normal_6033d51ee135a.pdfIn PDF document text
    • http://monufovaxuj.66ghz.com/soxepusepikesawazeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_6065a3e9aad37.pdfIn PDF document text
    • http://gejopuzebizovuk.iblogger.org/gatarozaxujatusa.pdfIn PDF document text
    • https://nepibosumu.weebly.com/uploads/1/3/4/3/134363752/mesozokabipatoki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455881/normal_5ffbb5101ebc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451945/normal_60090f6a329c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_3e2db94500bd4d17b3e68092efbfa619.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e3acbf-3106-468d-a1b1-14230b8af3b1/7172619938.pdfIn PDF document text
    • http://jawuguv.epizy.com/69381507664.pdfIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_1a6f07e402584da28f40784c2622b4d8.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_ae176a51d71a4e01bbbfc7f25f3ee93f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf2ec92-c8d4-4662-8f32-066c91c80e83/goxudefajulumusedenex.pdfIn PDF document text
    • http://sevetise.rf.gd/company_ratio_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c223468-0516-4255-a087-ba2d5e0b27ba/how_to_knit_for_absolute_beginners.pdfIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_299d5ab8761d44dc8cbe291f77952a8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2117e83b-4177-4e39-8d69-178c829908dd/mecanica_contable_de_los_costos_estandar.pdfIn PDF document text
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_7a8af572028e416cbfec6d35a11a2da9.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://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 5596 bytes
SHA-256: fa3bd28a61950db224eb970881297512042374d463aa9735ead4a902f48ef4d0
font_01_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 11676 bytes
SHA-256: 65fce2d5fcb77552b490bc3c67a6c7cf87368d78968438d2cad966dd5dace8a7

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