Malicious PDF — malware analysis report

Static analysis result for SHA-256 769960fec0268c23…

MALICIOUS

PDF

68.4 KB Created: 2021-03-21 09:25:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4fed07c6e2adceda5f3d1f0744f54f71 SHA-1: 89297299c691c6a2eae7be1721a176320162cb19 SHA-256: 769960fec0268c23e48ba354ada5c6a84ea064c6906eec60e4d05711ab26f346
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution campaign.

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://golowaki.ru/wix?keyword=framed+perspective+vol.+2+pdf+vk PDF link annotation
    • http://xogunajeraxuda.mywebcommunity.org/60518599350.pdfIn PDF document text
    • http://bestrongbyg.com/83782116354igqs8.pdfIn PDF document text
    • https://bosesupipi.weebly.com/uploads/1/3/4/8/134899809/617404.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/el_tipo_de_sistema_de_archivos_es_raw_chkdsk_no_esta_disponible_para_unidades_raw.pdfIn PDF document text
    • https://cdn.sqhk.co/bikugipozamu/jatxjhD/free_video_meme_maker_no_watermark.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_603d3bd047566.pdfIn PDF document text
    • http://witaxolexigabi.mywebcommunity.org/38534832720.pdfIn PDF document text
    • https://vakevugulipew.weebly.com/uploads/1/3/4/5/134507067/samoselopeber_notulurixixe.pdfIn PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/4845135.pdfIn PDF document text
    • http://pipavinekiga.mywebcommunity.org/cant_help_falling_in_love_haley_reinhart.pdfIn PDF document text
    • http://dihtyar.online/twenty_thousand_leagues_under_the_sea_bookmozyc.pdfIn PDF document text
    • https://samaruwopag.weebly.com/uploads/1/3/0/7/130738554/binufe-kufarowajur-feguporonuk-wesaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_603c7d2f531c3.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/igjdgcI/moksha_hinduism_ks2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litorow.myartsonline.com/bewefiguzobamu.pdfIn PDF document text
    • http://faleferesevo.onlinewebshop.net/suzuwul.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_off0000c5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F3 5544 bytes
SHA-256: e157b21ebb3594a7e04b7409fde1a97f7d9b5b0abea6e84cbc0e0dc6543b3564
font_01_sfnt_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 14128 bytes
SHA-256: 85be2abb82bd99dcd6b71ee5d3d8fdff36ae366172da1cb89d67ae0b3af5b276

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