Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b8d9573136053f…

MALICIOUS

PDF

85.6 KB Created: 2021-05-23 13:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 357d5f8e59a3604398af9c5effa47341 SHA-1: 91b5e9ccd6c0d9cc532bf21dfb821a45a4dfa078 SHA-256: 99b8d9573136053f6e71b366cef1f667c5f817461c039a1f97baa695902b84fc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the structure of the PDF point towards an attempt to redirect users to potentially harmful sites, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://seumenha.ru/strik?utm_term=summoners+war+transmog+january+2020
    • https://static.s123-cdn-static.com/uploads/4389793/normal_5fc6d81ef2475.pdf
    • https://rasafidi.weebly.com/uploads/1/3/0/7/130776861/balutewelawur-xetuloxufa.pdf
    • https://tenogamux.weebly.com/uploads/1/3/2/6/132681545/2202533.pdf
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/bea5f68aec.pdf
    • https://famexowizesiz.weebly.com/uploads/1/3/4/3/134359716/pemalefujabaxotugu.pdf
    • https://naweviwezufas.weebly.com/uploads/1/3/1/8/131856142/37d1f.pdf
    • https://cdn-cms.f-static.net/uploads/4388046/normal_6044938516ef7.pdf
    • https://lurusavi.weebly.com/uploads/1/3/2/7/132710630/50d2c43f22ce3.pdf
    • https://xelopapet.weebly.com/uploads/1/3/0/7/130775154/vosigizema-lalaxozu-talisiwi.pdf
    • https://nidatufibamukun.weebly.com/uploads/1/3/4/1/134131265/bilop_simirijarumive_vizekakinaxeki.pdf
    • https://cdn-cms.f-static.net/uploads/4485714/normal_6016350f503c4.pdf
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/ace59856b33.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pusolefosex/29159596316.pdf
    • https://uploads.strikinglycdn.com/files/5e7541de-01f9-48f4-9278-8add6ee3b14d/53728342356.pdf
    • https://uploads.strikinglycdn.com/files/923f9108-8daf-4f18-a7c0-5032ccb2f238/wafetaxelisinokososative.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/basic_tactics_for_listening.pdf
    • https://s3.amazonaws.com/baxekojojexusol/bbc_learning_english_for_pc.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f9b.bin
bfa21c209abc34e4ffaca7a3327adfff1212ff04e6ed490fa677f177b55011ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 5620 bytes
font_01_sfnt_off000122b9.bin
195251966381f1671aa8c9cfe35be240a2486b4b61bc0ebc66078d7fb6c00f1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122B9 11328 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.