Malicious PDF — malware analysis report

Static analysis result for SHA-256 81971c878b4f8a12…

MALICIOUS

PDF

90.0 KB Created: 2021-03-12 02:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f62604ed08975f6ae73282c22e9268c2 SHA-1: ea3c4a419facab237f9610efa906b3e516315cee SHA-256: 81971c878b4f8a123e7156849ec8462802a03ea7d3da3c4cb5a44580a8c2f0ee
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 0.9996

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://lozipotod.ru/wix?keyword=sbar+change+of+shift+report+template PDF link annotation
    • http://vivaxuza.iblogger.org/what_is_a_reset_button_on_computer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445866/normal_5fea07ea3a7db.pdfIn PDF document text
    • https://gazobibulome.weebly.com/uploads/1/3/4/7/134775133/xorotepaguvelig.pdfIn PDF document text
    • http://dovurulegusima.22web.org/instructions_for_knex.pdfIn PDF document text
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/vatezulolufimos-xuwabu-godozemetodamej-vefozoviwab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450870/normal_601faafa6e20f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413713/normal_5ff9e0ee8c86c.pdfIn PDF document text
    • http://vajukadezazi.getenjoyment.net/antigenic_specificity.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444378/normal_5fdda0a8bb9e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386076/normal_5fc88825c4121.pdfIn PDF document text
    • http://xokezuwadem.mygamesonline.org/bhagavad_gita_chapter_1_telugu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402000/normal_60093e28c1d79.pdfIn PDF document text
    • http://napowojeba.medianewsonline.com/mabovaki.pdfIn PDF document text
    • http://fibiver.mygamesonline.org/16558575971.pdfIn PDF document text
    • http://pigopivelar.iblogger.org/6135296194.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_161826c9695f4d948a6870096b655b65.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_08cf6c546f01483688704f74e73fdcc0.pdf?index=trueIn PDF document text
    • http://dixasimoxipux.rf.gd/timom.pdfIn PDF document text
    • http://tujupifirafadus.myartsonline.com/pokemon_fire_red_cheats_-_gameshark_codes_game_boy_advance.pdfIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_a5312b0e67864763a14d26878c176a7b.pdf?index=trueIn PDF document text
    • http://palakojum.rf.gd/ugly_duckling_short_story.pdfIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_cc3389df95204294a331df9d7cbe9de4.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 5672 bytes
SHA-256: b4baae58352f4fba1a1f64d407b874be6e92ae7285933f658288f766235aa7db
font_01_sfnt_off000133e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E9 11728 bytes
SHA-256: 022ea4c6d5889fab6aef0262109377ddc4f68daa93176d4f37a2a06b33d0c720

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