Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ffdabbae361a588…

MALICIOUS

PDF

76.3 KB Created: 2021-03-19 19:20:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1c13a7a067841c363929107c847bca83 SHA-1: bc147ac596b025f5d582e468b574bba07af28f1a SHA-256: 3ffdabbae361a5883c992a16ecc6f7bf3e6fdf4467cfe5fd7d875da6044a6e43
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing infrastructure. The document body is heavily obfuscated, but the presence of external links and the overall heuristic firings indicate an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/strik?utm_term=ethane+boiling+point+calculator PDF link annotation
    • http://mutujejeturuduf.medianewsonline.com/what_are_the_benefits_of_using_a_hyperbaric_chamber.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464734/normal_5fcdb630e18cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410030/normal_5fe46ffe50472.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/xexabenuq2u6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_60257a7e6d188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_6047703784a14.pdfIn PDF document text
    • http://garirixis.22web.org/australian_clinical_guidelines_for_stroke_management_2017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455396/normal_60163e1200252.pdfIn PDF document text
    • http://stonersfranchise.com/29975164050eusyc.pdfIn PDF document text
    • http://raisinsapp.club/denugoqxkmu.pdfIn PDF document text
    • http://nevozepamuj.iblogger.org/wedilogikuvavanopajovami.pdfIn PDF document text
    • http://shoop-fl.ru/gededipumulabatz5nx2.pdfIn PDF document text
    • http://rolorutebu.sportsontheweb.net/sig_p938_holster_with_mag_holder.pdfIn PDF document text
    • http://pe50off.pro/544455292156eb5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_34151932fc254c7e840d03ca1511b0ce.pdf?index=trueIn PDF document text
    • http://zikoliduxa.atwebpages.com/what_documents_are_needed_to_renew_georgia_drivers_license.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/basics_of_computer_book.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/jajadu.pdfIn PDF document text
    • http://dufobirufo.atwebpages.com/java_swing_tutorials.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/18331747948.pdfIn PDF document text
    • http://vepilezora.epizy.com/gabudutejunowofoxezubij.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/algae_biofuel_research.pdfIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_67b8987fa6ad46ae98fdca8024bdd76b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/rent_agreement_termination_letter_format_word.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_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 5116 bytes
SHA-256: 62eb64d97311745d48ce2ed1496798c4de8600fb5fb389077f3b5c369b943157
font_01_sfnt_off0000fe3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 11020 bytes
SHA-256: 4077a4bef339507797ee11b205fdddbfda9e0b772d6537962de0476e66d2f11c

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