Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd63fa5acfbeb0d4…

MALICIOUS

PDF

70.4 KB Created: 2021-02-22 16:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f211aefc1dfbdf08e99d105e3b03adb6 SHA-1: 052e785b739facd985326e0e6c45e9b15556c13a SHA-256: fd63fa5acfbeb0d482c7dab96bca917126467f2c0e252a476d37aeed141b0958
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. 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 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.
  • 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://jottigo.ru/strik?utm_term=ford+6.0+powerstroke+oil+filter+location PDF link annotation
    • http://vodoroding.info/nomibolefu0kxiz.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/8o83gct/management_skills_assessment_instrument_free.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/gYFhcjd/87899592378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463298/normal_600dc65e3398b.pdfIn PDF document text
    • https://cdn.sqhk.co/bamopilu/iaQghhd/xukolajarokelijuzofu.pdfIn PDF document text
    • https://pelabomorifij.weebly.com/uploads/1/3/4/6/134628360/nanudim.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/eggjca6/myhusky_login_hbu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5fdc5ef4e1778.pdfIn PDF document text
    • http://summ-green.fun/bofoguzobagtbrm.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/Zgeiast/papa_pear_saga_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456369/normal_5fd39ef81bd0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474475/normal_6030ac1dcecc3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xijotat.rf.gd/seresusegitifuma.pdfIn PDF document text
    • http://wonavoka.epizy.com/18800497496.pdfIn PDF document text
    • http://xalovizavana.rf.gd/mobile_website_template_size.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_off0000d6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EF 5588 bytes
SHA-256: 017b35fea78c96dca2a9afd69cca5f68d2937f600fce30f816c6ff87996d3a9e
font_01_sfnt_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 10004 bytes
SHA-256: f868748a2dc487d57ebf95ad29f1892e41fd7c1733e654e36f853acb96e0b0d6

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