Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6ac9e9e7da6876…

MALICIOUS

PDF

68.8 KB Created: 2021-02-24 13:22:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4c10546df761ff37b62bc896ee7846c9 SHA-1: cf05b3e25e43ea47532f1cf303b04c176db48f3e SHA-256: df6ac9e9e7da68760ad54bd18f195e35b227131e60df3f8c1c6c331dceea08ec
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' 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://jottigo.ru/strik?utm_term=miller+bobcat+250+manual+en+espa%25C3%25B1ol PDF link annotation
    • http://4escam-bot.online/fawupe0ii30.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/7233565.pdfIn PDF document text
    • https://xoludebule.weebly.com/uploads/1/3/4/5/134526363/lesek.pdfIn PDF document text
    • http://shop-kid-toys.online/fogugipusagibotuguwatanwvuy.pdfIn PDF document text
    • https://fakedowekiz.weebly.com/uploads/1/3/5/3/135314463/ac83b086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497109/normal_60126dfb9ae51.pdfIn PDF document text
    • http://naturalik.fun/download_extreme_car_stunts_3d_mod_apkh1hkb.pdfIn PDF document text
    • https://faxojoduso.weebly.com/uploads/1/3/5/3/135351685/5014210.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402267/normal_5ff02383cb480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_602ea30e671f5.pdfIn PDF document text
    • http://silkhfig.bid/unity_of_time_definition_literature7xap5.pdfIn PDF document text
    • http://trudogoliya.online/fisiopatologia_de_la_retinopatia_hipertensivavnr4w.pdfIn PDF document text
    • https://tezefuvin.weebly.com/uploads/1/3/4/4/134496048/c6de816032e.pdfIn PDF document text
    • https://vimexizud.weebly.com/uploads/1/3/4/7/134755563/c415a6dcf2eeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413462/normal_5fe185013bff3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widuxetikos.epizy.com/messenger_apk_free_2019.pdfIn PDF document text
    • http://jilerixam.epizy.com/65999691885.pdfIn PDF document text
    • http://kowewewabozete.epizy.com/apprendre__bien_parler_franais.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/mesebi.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_off0000cd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD47 5836 bytes
SHA-256: d8e837ed2c5b8b6d5ea56f2c1a24815d678953703efe81c8ef20dd62d837db31
font_01_sfnt_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 10304 bytes
SHA-256: 7477384f5881b4882ea2056491808644f7dd2b111a5914536eca408dc089f362

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