Malicious PDF — malware analysis report

Static analysis result for SHA-256 32cb43924df58e26…

MALICIOUS

PDF

102.1 KB Created: 2021-03-14 05:30:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4dc44d06ac7dcf8f4787004697bc8a85 SHA-1: 652d189cb7ba4620e06b26327b11e7105cc14fe1 SHA-256: 32cb43924df58e2676b0d82749a00e17094a436792cab0c59a39b770d179bc1b
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://xajibur.ru/award?keyword=aium+fetal+echo+pdf PDF link annotation
    • http://kernig.pro/21331384394ct079.pdfIn PDF document text
    • http://wulixiv.sportsontheweb.net/past_tense_present_perfect_tense.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/toneridivumudo.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/mole_concept_questions_with_solutions.pdfIn PDF document text
    • https://kutawujotin.weebly.com/uploads/1/3/4/0/134016956/6040273.pdfIn PDF document text
    • http://clientbluebadge.com/10930827182f03oi.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/depigulotopu.pdfIn PDF document text
    • http://afracheat6.xyz/391207665920b0pp.pdfIn PDF document text
    • http://rewita.fun/eragon_2_movie_in_hindi_free_downloadtplcy.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/bedtime_stories_for_toddlers_podcast.pdfIn PDF document text
    • http://trychambre.xyz/toastmaster_general_evaluator_role_scriptdq1lz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_5a777925c0d84d109e47be70109df6d3.pdf?index=trueIn PDF document text
    • http://salajire.onlinewebshop.net/7846596348.pdfIn PDF document text
    • http://rigidafavubo.myartsonline.com/el_alquimista_resumen.pdfIn PDF document text
    • http://pofijiserige.onlinewebshop.net/mandera_county_bursary_form_2020.pdfIn PDF document text
    • https://d397443b-80d0-4e74-967c-4ce830ee3754.filesusr.com/ugd/0a76f0_ef9bb36c7c39415e9ffb26619710b380.pdf?index=trueIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_4e0ac8005b3b448bbe18ed1c0dd6ef5b.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E02 5112 bytes
SHA-256: 8b632a22ccbfa6089e83da8d36e146ebfc2502666fda4ed307437c36a62fdfb3
font_01_sfnt_off00014f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F47 11676 bytes
SHA-256: 82b9d47d8d45f00b5b2779d8737e0b364103c555cb05042d6e3973d32b573e2d
font_02_sfnt_off00017690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17690 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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