Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7479e2c245e0629…

MALICIOUS

PDF

70.7 KB Created: 2021-03-29 19:39:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f5d8c9fb5f398dca7abd5e3d215caa27 SHA-1: 7251487a430cbbba039c71a891930b0cf266066e SHA-256: a7479e2c245e062990cbbc13280a8a15781505e363143c969bf7d787001bcd7b
204 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains numerous external links, including a primary redirector URL, suggesting it's part of a link farm designed to lead users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/wix?keyword=the+oz+principle+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403947/normal_6033be01bbb48.pdfIn PDF document text
    • https://kusikulovaledif.weebly.com/uploads/1/3/1/6/131606813/rekokogazi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408481/normal_600ed73cb0980.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479451/normal_60085ab0284b2.pdfIn PDF document text
    • https://rixabala.weebly.com/uploads/1/3/4/7/134730828/4825479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392474/normal_6023cf5dc1c92.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/0Kjjjep/fm_2018_goalkeeper_wonderkids.pdfIn PDF document text
    • https://cdn.sqhk.co/wanukawuwota/MXhjVBB/change_background_color_of_text_in_photoshop.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/iblO2hb/robots_coop_unlimited_money.pdfIn PDF document text
    • https://vodazifuja.weebly.com/uploads/1/3/4/2/134265633/rosexazigebatepu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453344/normal_5ff4656d9f497.pdfIn PDF document text
    • https://cdn.sqhk.co/zozijawutuxu/4ibheQT/50192906568.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavobawum/aadhaar_card_online.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/wawevuxebowalipokuniw.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/kg_cardboard_sheet_design.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/dungeons_and_dragons_3.5_character_sheet_fillable.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/jeep_grand_cherokee_pcm_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/vagiminakeko.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/71233108036.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/duluwina.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/why_does_my_dometic_fridge_keep_beeping.pdfIn PDF document text
    • https://bismiilahdown.blogspot.co.uk/?book=159859614In 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_off0000d7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 5156 bytes
SHA-256: f4c558c1a5dc900e1ba772665bbb43f606bbde3ed6721ae75a0056c338cbedf7
font_01_sfnt_off0000e944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE944 10628 bytes
SHA-256: ede1aa478776a5e63fc6ac6f1ce19bde289fa0b9792878672e7f302e7b5cf4e1