Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58b183bd446abc7…

MALICIOUS

PDF

70.6 KB Created: 2021-03-10 02:09:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c411b040d90a68eeb5fff5887292e45c SHA-1: 2057f87e0d137ae502251222b28d5f49387e7474 SHA-256: c58b183bd446abc7d91d3ddae0c74f3a045633899b40e170a6ce50010bc27bf9
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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 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/award?keyword=baa+baa+black+sheep+piano+pdf PDF link annotation
    • https://lotitarep.weebly.com/uploads/1/3/1/3/131383228/4bcb48a56dd6.pdfIn PDF document text
    • https://jagevugabawe.weebly.com/uploads/1/3/4/6/134631244/4976060.pdfIn PDF document text
    • https://falosaxosudo.weebly.com/uploads/1/3/4/0/134017699/zixivorinafaju.pdfIn PDF document text
    • https://fexalikinuzumow.weebly.com/uploads/1/3/5/3/135324316/9899294.pdfIn PDF document text
    • https://beburasitowetu.weebly.com/uploads/1/3/0/9/130969608/tudodi.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/19817895662.pdfIn PDF document text
    • http://rasazajafatirek.mypressonline.com/asus_z97_pro_nvme_support.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemabam.myartsonline.com/73780985622.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/8205007289.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/show_off_drowsy_chaperone.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/82056557480.pdfIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_0120d1007d71474fa797e123e38c7b50.pdf?index=trueIn PDF document text
    • http://jikelaxapexa.onlinewebshop.net/gepusobozasoduzo.pdfIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_c8fd125da0e04b709501b4bed476ee38.pdf?index=trueIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_08a161795f4b473bb8b7e507390d8d5c.pdf?index=trueIn 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_off0000d88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88A 5400 bytes
SHA-256: 3467c463a5f729784de8dbc4ebba3165f0658644b55971b7366a45892be5de00
font_01_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 10228 bytes
SHA-256: 85707c8541eb4a064b116642db1e98bd486956ae7f0d1d973f0854ea8ab5c1db

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