Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24ddae81512f996…

MALICIOUS

PDF

73.5 KB Created: 2021-03-23 12:37:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c3de205b83877a9902e25a092e38f06d SHA-1: 74b2624329ce584e74e37a595c8675c187e6a0bb SHA-256: b24ddae81512f9962a11bff20bd39e4223de099115c510d19cea2dec39d6424c
186 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many pointing to disposable hosting. The document body, though truncated and obfuscated, suggests a lure related to 'Calentador solar rotoplas pdf', likely intended to drive traffic to SEO-optimized or malicious sites. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly indicates a link farm or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/award?keyword=calentador+solar+rotoplas+pdf PDF link annotation
    • http://marketes.pro/sevegil9svoc.pdfIn PDF document text
    • https://visimekariluvog.weebly.com/uploads/1/3/1/4/131483525/xegij_gigigexalodunos_demidolatafexim_nekam.pdfIn PDF document text
    • http://top-agent.ru/photo_editing_app_for_pc_offlinentphf.pdfIn PDF document text
    • https://kagozekexep.weebly.com/uploads/1/3/5/9/135956698/3a7e2fb74f9.pdfIn PDF document text
    • http://weareanonymous.org/game_maker_8_3d_examples_downloadlt6mp.pdfIn PDF document text
    • https://doritader.weebly.com/uploads/1/3/4/8/134885844/b6795b.pdfIn PDF document text
    • https://zorutamazu.weebly.com/uploads/1/3/4/0/134096431/4221009.pdfIn PDF document text
    • http://robot3.site/m_audio_axiom_25_driver_macvxvop.pdfIn PDF document text
    • https://lirupije.weebly.com/uploads/1/3/1/6/131606624/3758fd47aee1.pdfIn PDF document text
    • https://kimetupuvojum.weebly.com/uploads/1/3/2/6/132680977/sixawuzujivituz.pdfIn PDF document text
    • http://5-euro.info/52586998785kc9la.pdfIn PDF document text
    • https://zamigemunizi.weebly.com/uploads/1/3/4/3/134347724/9063895.pdfIn PDF document text
    • http://prizinsta24.space/whirlpool_accubake_oven_manual_auto_clean1ll1c.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/3d4c1e8c-f289-406f-a02f-c8d873972430/78978468820.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/jamoxudebutudefubinupetul.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/68755544166.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/kibiletote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91fa1b29-77fa-4963-b0cd-4b1576e3cfcd/jikirorebufeluxexeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5859de6-580b-46a4-9533-e0188d61eda9/mulimifimakarabazebomenir.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_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 4940 bytes
SHA-256: aca3e625a147889bc327f59ec19a8c390108563430fa8e6207ed65b1e24d6a52
font_01_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 11500 bytes
SHA-256: df379625dc3383c5e9965abc1ba78d026561fe1ed50014900139eacd39f4444d

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