Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d1a6aa238c83e7…

MALICIOUS

PDF

70.5 KB Created: 2021-05-22 19:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6833087fdbe40d78527560af50d3f305 SHA-1: 4cddf488eabc525bb2620b6793bdce384c84d8dd SHA-256: f7d1a6aa238c83e7e6e1c88d7b999568be8259b528479de3995bf4eae6993053
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to product pricing, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=can+am+defender+hd10+price PDF link annotation
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/5786399.pdfIn PDF document text
    • https://niginijepajenok.weebly.com/uploads/1/3/4/5/134505752/9282705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501484/normal_603e0d094a6a2.pdfIn PDF document text
    • https://zolidejowifaw.weebly.com/uploads/1/3/5/3/135313364/kapidapokulet.pdfIn PDF document text
    • https://xadifopelizil.weebly.com/uploads/1/3/4/7/134771643/kuxowegokusaw_sivibexenisali_purevil.pdfIn PDF document text
    • https://poliradu.weebly.com/uploads/1/3/5/9/135991332/e831518e3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409628/normal_604a93e783aa0.pdfIn PDF document text
    • https://mugibutu.weebly.com/uploads/1/3/4/7/134714928/talamunixonibas_wunedurisasolep_dapiwu_fepobijadaveti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444377/normal_5ffe1ad2ed59a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf03710e-1ede-4c31-9e3f-f437384952db/pedidowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5f29381-9e17-4e00-81f4-cc9983f1a458/20573539906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f967ba-ed34-4677-a070-1847b9cbfd22/59304841288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9305118d-a892-449c-90c6-7a0d66d45cf9/95904754622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60969c97-073d-4550-9cd1-70afeb2959f6/what_gre_score_do_i_need_for_vet_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/910cebea-7e81-496c-8412-ee601c39b1c2/zefititaretofezuvixobugag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd7b1c9-6599-4f69-9694-08de775b44db/divis.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_off0000d5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 5284 bytes
SHA-256: 19cd4715056f221565978c71e68623128494f96029a66cfedb9d7f35f033cea0
font_01_sfnt_off0000e7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 11100 bytes
SHA-256: 3e13aad8c95a2154849a3df006a71dea051061823ee3ad28ca95b566ae02eb86

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