Malicious PDF — malware analysis report

Static analysis result for SHA-256 a165bf415721cc23…

MALICIOUS

PDF

79.2 KB Created: 2021-03-09 09:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: de7838ee417ad010c277c61d634dd50d SHA-1: 92d6ed7e6c347493de256f06bbf30b5f210fb605 SHA-256: a165bf415721cc232408749cd19b757b5123620e7fc5aea734d6ac81135b3ed2
134 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 external URIs pointing to disposable domains, a common tactic for phishing and malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of a download button lure further supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://druttle.ru/strik?utm_term=percy+jackson+and+the+lightning+thief+pdf+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389387/normal_5fcf27e10a9d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479460/normal_6041a33b417be.pdfIn PDF document text
    • https://xibatelilon.weebly.com/uploads/1/3/1/6/131637149/d860c1d3a6a23.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/77358054932.pdfIn PDF document text
    • http://gubuxuk.scienceontheweb.net/wabewuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_602b359669ddb.pdfIn PDF document text
    • https://jotozured.weebly.com/uploads/1/3/4/5/134588142/felowez.pdfIn PDF document text
    • http://kavademive.sportsontheweb.net/didoras.pdfIn PDF document text
    • http://giwitijudaleka.mygamesonline.org/how_to_use_smokey_mountain_weber.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/napejaxosinages/86914317103.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/wiporexerawetutimoxatobed.pdfIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/71409439444.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/how_to_hang_a_hot_dawg_heater.pdfIn PDF document text
    • http://suvalomimo.atwebpages.com/79380726749.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/xutavuzomuv.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/kebolejexuwuloxamukav.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 5448 bytes
SHA-256: 7ce64168dd92f977db72352c1ed9a30a93c4d5b12a202c1f0973d84fe848c5e0
font_01_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 10992 bytes
SHA-256: b2dd8de9c8da289b7cadb04cece1e34b306fbf7b9ca6b1b3c4dbb60a946badbe
font_02_sfnt_off00012125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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