Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a685de541dcfbf…

MALICIOUS

PDF

80.8 KB Created: 2021-04-03 05:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: cda3fae233697f094984164a7d0df409 SHA-1: ec62e88f5424e4ac13384a459ecd79f2e04f9b95 SHA-256: 18a685de541dcfbf1e4f200b85384e6c3e40172e1a9dcdae92ae9eca49d8b51e
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to zajinet.ru, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=decolonize+your+diet+pozole PDF link annotation
    • http://1pokypki.website/comparatif_et_superlatifqhqj9.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/ihjigQL/losusetan.pdfIn PDF document text
    • http://all-gopro.com/kojazakesudemibinejomusxo7l.pdfIn PDF document text
    • https://cdn.sqhk.co/sowodopevew/74heic1/accuradio_mellow_smooth_jazz.pdfIn PDF document text
    • http://togilikosilit.22web.org/50632961838.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_60181ca091539.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417992/normal_5feb4a6620c05.pdfIn PDF document text
    • http://rankingcoach-apps.com/xefetafuzuwajpz3w5.pdfIn PDF document text
    • http://mobotav.22web.org/dogonuduk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369659/normal_6033b7a2939d5.pdfIn PDF document text
    • https://cdn.sqhk.co/zemakojunil/ifAdggX/lexefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460690/normal_6024eecac9acd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0539dd93-9f4c-4732-ae33-c319bf398aac/zupas.pdfIn PDF document text
    • http://sajogat.rf.gd/gnostic_book_of_changes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/774c5685-5c92-4431-8ac9-8aede9e8fb36/33971086518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8096b99a-bb5a-4e04-a14e-68e77ed51f89/99583782158.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/cours_et_exercices_corrigs_d_algorithme.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/what_is_the_standard_enthalpy_of_neutralisation.pdfIn PDF document text
    • http://tefolinum.epizy.com/99792122417.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 4712 bytes
SHA-256: 367647e51c5114857db665d86af57901fc94ccebf91671b82c2236c62bb988be
font_01_sfnt_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 12020 bytes
SHA-256: 25076a16e7e1d0f230936a9980549ee2612d1b4fe541d3dcb78e1f5d8ffadf49
font_02_sfnt_off000127b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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