Malicious PDF — malware analysis report

Static analysis result for SHA-256 76de78711883fb3a…

MALICIOUS

PDF

72.3 KB Created: 2021-02-22 15:22:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fb4598185cbc223b04d63f5add1c56cf SHA-1: f2d65f956669f52353f554ffb36de2ed7aa9c46e SHA-256: 76de78711883fb3af504282f80c4653059936d87daf5b56b350a1be49ce2cff7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=how+to+find+network+security+key+on+spectrum+router PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453105/normal_6025dd776378f.pdfIn PDF document text
    • http://wamawebikojas.22web.org/riwewu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378605/normal_5fe5e7f5054d9.pdfIn PDF document text
    • http://1cats.space/basic_microbiology_salariesb17ii.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426945/normal_5fc6b51dbff4c.pdfIn PDF document text
    • http://arevakar-travel.com/ninuvapalqjkq.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/kenubeferer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495269/normal_60298abeab572.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/tafugitowoxi.pdfIn PDF document text
    • http://yourlivehelp.com/532130323332k08q.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/napejaxosinages/stress_management_journal_articles.pdfIn PDF document text
    • http://xutulatovemi.epizy.com/suwavofopefigesiwabik.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_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 5280 bytes
SHA-256: eec02eaf8597828c6846ab9e97b2670cf2b2ab48bc77b53047467af5e07c52a9
font_01_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 10140 bytes
SHA-256: e3f03f44326d25fcf5bfd3ffebb465c3b17af4eeef68fe5e80ec44e11b3bd6f2

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