Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3068e6c8094513…

MALICIOUS

PDF

110.5 KB Created: 2021-03-03 01:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 6b0929a6e0622884b21a675fe8f71a2d SHA-1: 42b5ce7812b86bff39c4ea543d0e96550ee8ae47 SHA-256: 8c3068e6c8094513f6342a5039910fe5dfd4196aeb7863fbfef3b99538cd7b01
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, despite being heavily garbled, suggests a lure related to Spanish verbs, which is then used to disguise the malicious links.

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://druttle.ru/strik?utm_term=lista+de+verbos+regulares+e+irregulares+en+espa%25C3%25B1ol+para+imprimir PDF link annotation
    • http://wejuzofibab.medianewsonline.com/38131200578.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424689/normal_5fdf720be9948.pdfIn PDF document text
    • http://pemizirevubel.mywebcommunity.org/craftsman_electric_chainsaw_18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_603076c176ef3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382779/normal_5fd08b01ed123.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/bozulupo.pdfIn PDF document text
    • https://vetaguluxidi.weebly.com/uploads/1/3/4/6/134656260/d33019ea.pdfIn PDF document text
    • http://misovar.22web.org/nezibuverujijik.pdfIn PDF document text
    • http://pusokum.66ghz.com/vault_app_free_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417525/normal_6036016f1f0f8.pdfIn PDF document text
    • http://xodokevazijif.22web.org/how_to_use_stanley_jumpit_600.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lipaxubizilek.epizy.com/just_the_way_of_the_world_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/refractory_hypertension_guidelines.pdfIn PDF document text
    • http://gamutazuzores.epizy.com/38205728453.pdfIn PDF document text
    • http://wobagelamabix.rf.gd/klinger_sls_gasket_sheet.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/30663448089.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_off00016eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EAB 5632 bytes
SHA-256: d51cf1f859a711fc25b35ca4541868aed30d3e1e5d3e50882c910c0058b6b67b
font_01_sfnt_off00018182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18182 13372 bytes
SHA-256: 5b30218ecbb8e33fba10139c285948dda1b926b68507d28767c8927e53709789

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