Malicious PDF — malware analysis report

Static analysis result for SHA-256 a894918cfb467212…

MALICIOUS

PDF

77.4 KB Created: 2021-02-25 07:00:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f85e4d434071c311c65ce11c69a1761a SHA-1: 2b5d169fd65061aad0f6dd4efe9463e3f9a40bc6 SHA-256: a894918cfb467212d3dc3217b9aafeaf23631d027e644f06f44e1c6b69e04aaa
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or redirection infrastructure. The document body, though heavily obfuscated, appears to contain keywords related to common search queries, indicating a lure to disguise the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://druttle.ru/award?keyword=how+to+descale+breville+express+coffee+machine PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385427/normal_5fedba2f7a61a.pdfIn PDF document text
    • http://jirafka.space/bixakisibubapovokijolevug8kiu.pdfIn PDF document text
    • http://stonersfranchise.com/employee_development_plan_template_pptcddwr.pdfIn PDF document text
    • http://ndfnasg.xyz/government_spending_trim_that_budget_worksheet_answersktfcb.pdfIn PDF document text
    • http://moresukko.ru/taittiriya_upanishad_in_tamilb1pxi.pdfIn PDF document text
    • http://magnitoli-2ekran.site/linuzekokifame7xe9c.pdfIn PDF document text
    • https://bowetupivivuz.weebly.com/uploads/1/3/1/4/131437724/e6f25e1221e78.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/a19b4fe647eb938.pdfIn PDF document text
    • http://kalanuso.iblogger.org/is_maximum_ride_the_movie_on_netflix.pdfIn PDF document text
    • https://sinuvuliwazima.weebly.com/uploads/1/3/1/8/131871572/suvuxumopowem_giwazebe.pdfIn PDF document text
    • http://liwitavazij.iblogger.org/buscopan_simples_injetvel_bula.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/rebesudanolo/93769483415.pdfIn PDF document text
    • http://refedeto.epizy.com/polaris_360_bag_leslies.pdfIn PDF document text
    • http://dujoserowumil.epizy.com/apics_supply_chain_management.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_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 5716 bytes
SHA-256: 4821ba66dd6616daff311eb8b87f3aab9174c3f997fb7b367dda08f4d8c8dee1
font_01_sfnt_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 10920 bytes
SHA-256: 956b6878f0f52069ff9ec2750cf63859a10426f4b0b3672822bd4dc180c08850

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