Malicious PDF — malware analysis report

Static analysis result for SHA-256 4068a6e3d378e5d1…

MALICIOUS

PDF

72.9 KB Created: 2021-03-19 12:04:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 596e1a9a04d9c2002a036b1f91c2a2ae SHA-1: a315461081c913400460f1df5295fd7430d7b707 SHA-256: 4068a6e3d378e5d1ec0032d670c99abb490d1ebad4268d0fd34cac56a2997771
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with several pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though partially corrupted, indicates a lure related to "bike repair manual pdf" to entice users to click on these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/award?keyword=bike+repair+manual+pdf PDF link annotation
    • http://sujabupinoda.scienceontheweb.net/adidas_watches_price.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/ji54lha/great_little_war_game.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/landscape_architecture_vocabulary.pdfIn PDF document text
    • https://cdn.sqhk.co/riraxizilob/Gidiafd/xojevubawetewig.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/c4jg6id/hornblower_books_review.pdfIn PDF document text
    • https://cdn.sqhk.co/ropikenetu/hejanKE/vareli.pdfIn PDF document text
    • https://cdn.sqhk.co/nukebomevobe/Ujbhjgh/19107184291.pdfIn PDF document text
    • http://tonevagewalilu.medianewsonline.com/wizefotutizimewosiwod.pdfIn PDF document text
    • http://jujokifenake.22web.org/symmetry_in_nature.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/dufekasonuderosofo.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/nemafu/bedolaxifixokadejobax.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/57074840408.pdfIn PDF document text
    • http://pijosufun.myartsonline.com/kabuma.pdfIn PDF document text
    • http://lijezuzoxej.epizy.com/vupejodixoxuvana.pdfIn PDF document text
    • http://lurotibiripan.rf.gd/barrera_placentaria_farmacologia.pdfIn PDF document text
    • http://jujuletofu.onlinewebshop.net/luroreviwunufarux.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/livros_brasileiros_para_jovens.pdfIn PDF document text
    • http://jafepotafeno.epizy.com/contractions_worksheet_5_answers.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_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 5124 bytes
SHA-256: bfa9908df8f06ee700b5a36ca888eb0160540f5e6ef25ff29175a538ae3e9868
font_01_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 10928 bytes
SHA-256: bfd472b7d681e50906ae4570be0888abb0541946e9a37b556ef9cb22d0c486b7

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