Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa5fbf8596788ac…

MALICIOUS

PDF

83.9 KB Created: 2021-04-30 13:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6a1c2c9ba85ff8ba054393ada0016f10 SHA-1: 21921eeecd79a7b0de9b1fe39e1fb8e98c757c0b SHA-256: 8fa5fbf8596788ac33a7c230dccfbf6bbd0db7552040796c037984392efe244a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The primary URL, 'https://leonvi.ru/strik?utm_term=maytag+neptune+washer+and+dryer+stackable+won%2527t+spin', is likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure itself is used to facilitate the redirection.

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://leonvi.ru/strik?utm_term=maytag+neptune+washer+and+dryer+stackable+won%2527t+spin PDF link annotation
    • https://majizozu.weebly.com/uploads/1/3/4/5/134598595/5773008.pdfIn PDF document text
    • https://cdn.sqhk.co/dediwifime/iCgghgw/dark_knight_rises_villain_images.pdfIn PDF document text
    • https://pusosisuko.weebly.com/uploads/1/3/6/0/136094517/xomemokobo-paxamawuza.pdfIn PDF document text
    • https://cdn.sqhk.co/xezalagefog/cYhghgg/62948065175.pdfIn PDF document text
    • https://gefatute.weebly.com/uploads/1/3/5/3/135345711/1006998.pdfIn PDF document text
    • https://jozisanolotodix.weebly.com/uploads/1/3/0/9/130969335/030ebf24a297f.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/7hij3jc/41594665901.pdfIn PDF document text
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/5181d88c762069.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_9e0f4aaae8cb4f53897bc8c4420b4a2d.pdf?index=trueIn PDF document text
    • http://zidukimozefuz.rf.gd/benzinho_jacob_do_bandolim.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/xomeluzuxemedemisoniki.pdfIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_444adcb2363547c58a5704316769f60c.pdf?index=trueIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_75a101029ea446e3afb7ebdec4795b3d.pdf?index=trueIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_cf41b8bfaf2541bbba4d9b5417b82849.pdf?index=trueIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_ccc353eadf944d0e857fac6530b92e15.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_06e96a6420d64eaf83adf1ff3fc0b091.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najubu/8907021332.pdfIn PDF document text
    • https://8b62b971-d575-4461-ae89-9de7a2afac08.filesusr.com/ugd/c5a911_e1abebe3ae5b4121af5c9bdf211be03c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zowibatev/lego_city_undercover_ps4_game_guide.pdfIn PDF document text
    • http://marivugedada.epizy.com/arabic_language_history.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_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 5772 bytes
SHA-256: 8eb616a941ec6d23a11987d70a9cf7527bbaf71b2610c8ce5dd5a736d2a4446c
font_01_sfnt_off00011e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E81 10360 bytes
SHA-256: 3717bd9e068db3aa0a2ec4e835581e3f69f91ea8ae88cb0f09b7821a9274610e