Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e38304ba43cdf5b…

MALICIOUS

PDF

73.8 KB Created: 2021-03-03 08:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 469feb681420cbd55ea03cc195eff4ad SHA-1: 840206aa0a8259f4612403cc817c2348a4c6ef8a SHA-256: 0e38304ba43cdf5b6640c4c255e6b43181a6c970692b42a98749bf5148cecfca
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded URLs, with a primary focus on directing users to `jumiwimov.ru` under the guise of information about 'cronbach's alpha'. The document body, though heavily obfuscated, appears to contain metadata related to the topic, suggesting a social engineering lure. No scripts were extracted, but the PDF structure and numerous links point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=when+to+use+cronbach%2527s+alpha PDF link annotation
    • http://zogometemo.sportsontheweb.net/gofogojalodapamunodurujib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390684/normal_5ffae782a75d7.pdfIn PDF document text
    • https://puwegamojone.weebly.com/uploads/1/3/4/7/134702565/8df4ee0c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473619/normal_60023845a08d7.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/eiaBLgh/88068307859.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxegaxujifo/F5iMhjS/17996134232.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/zunegugasaw-fipekovegalebi.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/dgdngUo/fidilivimilunus.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/ibhe8ge/lawexekakavaj.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/97129175380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_602ba39babe50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/39642433986.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/68054593454.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/ruzujarugiber.pdfIn PDF document text
    • http://wenibeliso.atwebpages.com/xamowebulugigopefozo.pdfIn PDF document text
    • http://zizenatoxu.myartsonline.com/77744979730.pdfIn PDF document text
    • http://lijowavatajo.myartsonline.com/what_is_the_cohesion_tension_model.pdfIn PDF document text
    • http://pogetowem.onlinewebshop.net/67010489315.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_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 5208 bytes
SHA-256: 4798070a2ba48f47f9833a79db706ad7f10bdbc2cb12f263099fcb29a70fca06
font_01_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 11000 bytes
SHA-256: fa3e04e6f6c7d990cca95b0ff5b01a5a5f8e56701636ea31d5fcf67cd50be21a

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