Malicious PDF — malware analysis report

Static analysis result for SHA-256 d844755d47f79d65…

MALICIOUS

PDF

79.0 KB Created: 2021-02-17 16:15:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7ffd92ef8228a3afa673dbbf72db2085 SHA-1: d33bc7683c52f510b1e973db8e054adeaf0ea683 SHA-256: d844755d47f79d65f213593aa6c76b2003315b480158a61bdb97a057bbba685a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically titled 'How to reset a viper alarm' pointing to a suspicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://crophysi.ru/strik?utm_term=how+to+reset+a+viper+alarm PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417413/normal_600a19eded352.pdfIn PDF document text
    • http://xojitufos.66ghz.com/europa_universalis_iv_trade_guide.pdfIn PDF document text
    • https://nebowepef.weebly.com/uploads/1/3/4/4/134483035/rusuguselagatuxuvuno.pdfIn PDF document text
    • https://kujunegisim.weebly.com/uploads/1/3/1/3/131380440/29ec934a7.pdfIn PDF document text
    • http://yourbigdick.space/the_poisoner_s_handbook_worksheet_answer_keyaxszp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490272/normal_5ff6b2e6e9615.pdfIn PDF document text
    • http://instapresent.site/nujetenometaxobosimela8g1ne.pdfIn PDF document text
    • http://zufutefej.22web.org/baazigar_song_whatsapp_status.pdfIn PDF document text
    • https://tupadutuxoti.weebly.com/uploads/1/3/5/9/135974222/51a0c646350.pdfIn PDF document text
    • https://nipoxumafoji.weebly.com/uploads/1/3/4/7/134717148/6fba2.pdfIn PDF document text
    • https://fiwadevu.weebly.com/uploads/1/3/4/5/134592392/8518929.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394077/normal_5fe5fbc52aed4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fabowifomewod.epizy.com/70022255898.pdfIn PDF document text
    • http://ligexaxo.epizy.com/mivazowoto.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/how_to_sell_network_marketing_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/71833505813.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_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 5080 bytes
SHA-256: 17d63b7a95d54eebf106bfaa1db33c8383bfe8c6db7aa759a842ec7617741c33
font_01_sfnt_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 12368 bytes
SHA-256: b09881a423e3467ecb13f94ceb82806835a42781da7f90b38ca31a10a735ec0c

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