Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e58f6bf30373c65…

MALICIOUS

PDF

87.4 KB Created: 2021-04-13 09:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1d80af92af8380661ccb09b0d144bc9d SHA-1: 4fc07b0e5a74def1f6ccbcafa4fdc212fe479fed SHA-256: 8e58f6bf30373c65cd84b95e0cf1c6e8dd92999d19a24d2eab38593a60ec671f
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting, indicating a link farm designed to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/strik?utm_term=pltw+unit+conversion+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462059/normal_601028aa3e09f.pdfIn PDF document text
    • http://graatorama.fun/2001_club_car_ds_parts_manualbus0j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500430/normal_6050f9a09e3a3.pdfIn PDF document text
    • https://wokuzavewa.weebly.com/uploads/1/3/5/3/135339714/8981200.pdfIn PDF document text
    • http://connexion-amelii.xyz/roxudagijawituse43m93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450034/normal_604d24f41e334.pdfIn PDF document text
    • http://all-host.site/amapiano_beat_maker_2_apk_download6v6sn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413566/normal_5ffa2fe77a34b.pdfIn PDF document text
    • http://richteam.site/readywise_organic_emergency_food_supplyoqjkf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_6050d527bc77a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366348/normal_5ff349d3cf8a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_605ac70adaa23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426415/normal_60264e28016d3.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/nizubobewanotutez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373271/normal_5fc9b199686ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_60464173d60d8.pdfIn PDF document text
    • http://phulop.store/572105336877g7ye.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://83662c7a-80c1-4e94-b5a4-3df479670d58.filesusr.com/ugd/27be29_49d08094381144b0ba82469fa078faa1.pdf?index=trueIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_024b9a826c8343cd95601540ac16e03c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/98571900385.pdfIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_9b0e63a2f1ae4fc086e0be78e5a290c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/53612731534.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_4155d3e99c464c23b88c931e277732f3.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_off00011994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11994 5112 bytes
SHA-256: c0b4ed741d64f92dae080507f65c810e23ec705ab74f2a9cbd8264545667fb44
font_01_sfnt_off00012b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B26 10944 bytes
SHA-256: 6351577adf0dc0a578c029131f2be2bfd13efb9047380a6e2d36d92f5d036157