Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c36b30b80d89316…

MALICIOUS

PDF

67.5 KB Created: 2021-03-15 14:32:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 027d131d8c9a129a1498c86b6cc25cb7 SHA-1: 790868db63cf82ef97ab19407ac164e834a1d47c SHA-256: 7c36b30b80d893164d37c5305d7313428c3cf2c4c7ba155dfa7d11b1848cc524
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

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://midufefew.ru/wix?keyword=brs+pharmacology+flash+cards+pdf PDF link annotation
    • http://coolvdomaion.online/libisimujujumadarudg07q.pdfIn PDF document text
    • http://sunmarkt.ru/what_is_social_constructionism_in_psychologyt0llz.pdfIn PDF document text
    • https://nepubodi.weebly.com/uploads/1/3/4/6/134610278/jelavuzerowutuxev.pdfIn PDF document text
    • http://butuvaguji.iblogger.org/54122770924.pdfIn PDF document text
    • http://libralab.digital/155194075568469k.pdfIn PDF document text
    • http://uspex22.online/juwegesadipaspypmf.pdfIn PDF document text
    • http://vipodesin.22web.org/10513695602.pdfIn PDF document text
    • https://tibomomaludo.weebly.com/uploads/1/3/0/9/130969572/bebuvogekesube.pdfIn PDF document text
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/748070.pdfIn PDF document text
    • https://fuwodeku.weebly.com/uploads/1/3/6/0/136095673/fiwenaj_nazido.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xupikilagi.rf.gd/sitosatupupixuwisumova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb69792-e1a3-4cd0-b6da-02dd65bf8af5/fusifopigidokexen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0446e616-053d-4c20-a8c5-11bae1eb0f91/zojifuvazutabenevato.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/13714468957.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/55904104233.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/bansuri_tune_free.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_off0000cb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB65 5720 bytes
SHA-256: b4989c93ed351f056a661000457d2fda737ead4c573ecb997f50d0180005c3fd
font_01_sfnt_off0000deb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 10080 bytes
SHA-256: f3128782bdafd584b1f5ad750d4e5cffcc836a9e50df3105013f9ad04cd439cc

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