Malicious PDF — malware analysis report

Static analysis result for SHA-256 a098f9ea80e621ab…

MALICIOUS

PDF

79.1 KB Created: 2021-05-28 03:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 542f329f0b4b93a7f2e0cf6f7a10e490 SHA-1: 2ba1d2c889c8c5ad8f910c3700029d63c4528444 SHA-256: a098f9ea80e621ab54b4a80ef20f5b80b472e7f7432a0273e18d780dd5a62f4f
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic or host malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or extension. This, combined with the ClamAV detection and ML classifier, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://kuzutuzo.ru/strik?utm_term=download+fast+and+furious+3+full+movie+subtitle+indonesia PDF link annotation
    • https://vufofameti.weebly.com/uploads/1/3/0/8/130874118/pizezopo-benam-nibajofiwun.pdfIn PDF document text
    • https://tatojevukud.weebly.com/uploads/1/3/7/5/137508330/9030365.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490547/normal_5fe08cfae05d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_5fd1726a7f9ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390664/normal_605b6528ac33a.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/19d09231ba8682.pdfIn PDF document text
    • https://winomawapaba.weebly.com/uploads/1/3/5/3/135334931/3613929.pdfIn PDF document text
    • https://labiduto.weebly.com/uploads/1/3/4/5/134584073/dojipilud_vepinotezineme_piduvonegorije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393638/normal_605d8ff94e3dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5fd799419f154.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372955/normal_5ffd3b029123c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476436/normal_5fe3a71b153ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379043/normal_5fe053b95fbf1.pdfIn PDF document text
    • https://mawanegofarate.weebly.com/uploads/1/3/4/4/134466522/zavotigerugine-vesurulitosozim-samolebezanevir-jirimud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492529/normal_600fbcafce250.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab1294b-05ce-48ea-9330-f9be444ae1fe/how_to_fall_in_love_again_36_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b375cf-8ad2-48e3-835a-374c53a30f90/what_is_the_best_water_dispenser_brand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67cda103-f154-43a2-89d1-42409b39714b/vevewesigozobafedere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bca82594-6008-48dc-98f9-ebc560f238b9/11773069228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6caf611-4c87-45d4-8b4c-bed0a5ab64c5/understanding_japanese_society_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe877ef3-ca03-4f90-91ef-21b5b19e08bc/beowulf_michael_morpurgo.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_off0000f715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF715 5508 bytes
SHA-256: b059366a27f8c194da6caa3a994092b2caeaf010d4c59d15ab9a9a379a9eaef9
font_01_sfnt_off000109d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 10748 bytes
SHA-256: cf0b48af2374ec3d2d48dbcc266d18632a32bcab9309f633a994c5fccf0776ad