Malicious PDF — malware analysis report

Static analysis result for SHA-256 939b8e5f785fbee0…

MALICIOUS

PDF

82.5 KB Created: 2021-06-02 18:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 312d5d680d4a5cb3b56e8a945d78e23b SHA-1: 12d52674f5733bf0542a191072faa1ffb9929d13 SHA-256: 939b8e5f785fbee08405686d524f6b15ca384d17eebfe5a91eb070a8e8a2927e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/pbw?utm_term=how+to+get+sponge+collection+hypixel+skyblock PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417023/normal_6066bd0581ec3.pdfIn PDF document text
    • https://batoxomaziforu.weebly.com/uploads/1/3/4/7/134708014/886013.pdfIn PDF document text
    • https://judewefa.weebly.com/uploads/1/3/4/6/134652715/7001692.pdfIn PDF document text
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/9fa17a395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_5fd29bebb8bdb.pdfIn PDF document text
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/pujazu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4416930/normal_60b0f159be75a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144420888/tasen.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/f/90217010624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80100ddc-98f2-4393-ba35-5c053ef9b7c2/teaching_english_grammar_vk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba847462-107d-490d-aadc-f6c03a5f5494/love_quotes_from_like_water_for_chocolate.pdfIn PDF document text
    • http://memofemovo.pbworks.com/f/fivodemigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5e45d9-4353-4c32-9748-3d3737c83870/53411750544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23b1349a-3399-4353-b3af-61773aeb574a/54016387340.pdfIn PDF document text
    • http://nefusim.pbworks.com/f/ser_worksheet_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cada0ede-1832-452d-88ac-9fc926cc204c/muwogudopoziki.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/w/file/fetch/144511179/57869606001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51a2bf6-b8ad-454b-9aad-46fe21299bff/channels_live_tv_fancy_bits_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a53e0c-cab1-4dc3-9e47-6d5278de78c7/15893121706.pdfIn PDF document text
    • http://sajateves.pbworks.com/w/file/fetch/144469524/46419392497.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_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 5316 bytes
SHA-256: 68a24efb87e15a3fc548c4e6fdfdc1c59235992b876fe13e541550c31072beaa
font_01_sfnt_off00011494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11494 11916 bytes
SHA-256: 4141eb0b552f36ffdde2df62b0656f7b214fd7d9cc0e96cd05be086960dec452

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