Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8ce9952f9ff046…

MALICIOUS

PDF

73.1 KB Created: 2020-12-24 06:22:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e949719845be6ac5d499cc66fe74446d SHA-1: 9d00984edad83dd5755dbbf9941a51ecebe0eb81 SHA-256: 4d8ce9952f9ff04658fafab7a2258057cd1b1600e4b822437f2e5fe27579e294
164 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 links, many of which are dynamically generated and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The 'CLAMAV_DETECTION' heuristic further confirms its malicious nature, identifying it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains references to 'Brasfoot 2020 atualizacao' and 'wkhtmltopdf', suggesting a lure for a software update to trick users into downloading a payload.

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.
  • 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://traffnew.ru/strik?utm_term=brasfoot+2020+atualizacao PDF link annotation
    • https://cdn.sqhk.co/duwewofowus/ighii5x/zuzafebavoruvuzuverot.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/fogikisimixe_wadazemigonu_xitudi.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/hacGTZf/61814509746.pdfIn PDF document text
    • https://cdn.sqhk.co/solumapidema/eiaHjbZ/11357463141.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/jwidpd0/46790904778.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/hhj4jhb/43396938260.pdfIn PDF document text
    • https://cdn.sqhk.co/gibuzini/ifieQig/72230952909.pdfIn PDF document text
    • https://woxomeze.weebly.com/uploads/1/3/4/4/134498023/xibufifofozawesosop.pdfIn PDF document text
    • https://cdn.sqhk.co/nivipanevi/1dJjdfR/16641485066.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/5fe28a81-8525-4e14-af3b-b521ed790faa/dekesipelaba.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/bajaj_allianz_policy_surrender_form.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/91768852839.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/28176504119.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/parenti_blackshirts_and_reds.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/jurassic_park_movie_tamil_dubbed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3714273d-a443-44ff-8933-54686ea10b24/83261578030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3fdbcc7-74c8-49a7-a5a1-54c876091227/sekonic_l-758cine_vs_l-758dr.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DA 5248 bytes
SHA-256: 1e4a1dec6167ff3761dfe5fe65340391a667f1298bc1b616aee1bad3a4ad5bbc
font_01_sfnt_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 11324 bytes
SHA-256: 5654359be9d3167c9be8a416c42f8d9ec7e07b27e1801892b3152af30f496e2c
font_02_sfnt_off000101f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 16180 bytes
SHA-256: 7c776e5eea023699f371194d12e6bf94cc07d0f218a2e329aa39d16e66640f7a

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