Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1cdf1d9e99acd96…

MALICIOUS

PDF

66.9 KB Created: 2021-04-02 18:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8f695abe917e7e0927a7c2c31815b929 SHA-1: 11405c12bf5005e68bc43ba7d702b479f5e86937 SHA-256: d1cdf1d9e99acd96d1b81419cc1295995a6481e23b8e06e2af4383caaf4725ae
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 0.9998

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://midufefew.ru/strik?utm_term=how+to+forward+calls+avaya+9608 PDF link annotation
    • http://sportplays.ru/vajiguniwapeziwazibod8sld.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/b4dhgww/nature_sounds_music.pdfIn PDF document text
    • http://cardio-active.site/fafamapany5l9v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_60204a116f268.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/jhLMIUS/who_information_network_for_epidemics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_6060fef88b099.pdfIn PDF document text
    • http://varuzajuv.22web.org/bagaimana_nak_buat_google_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393028/normal_602cdd1ece7d4.pdfIn PDF document text
    • http://lebuvowune.getenjoyment.net/kuvefifodufimuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guriseb.myartsonline.com/stethoscope_uses.pdfIn PDF document text
    • http://genovadeni.epizy.com/imperialism_2_official_strategy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/950c47e0-719f-4098-9b58-847b8a59fb61/54745795673.pdfIn PDF document text
    • http://nuzavaxevarap.epizy.com/excelsior_college_accredited_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37dcf28a-080e-4081-b95d-2332c64929ff/how_to_maintain_a_toro_lawn_mower_blade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53bdd2d9-8b84-46c8-8f02-e71e4b73530b/xilusesamemigaduxutovek.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_off0000c639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC639 5876 bytes
SHA-256: 6ada58255fa40d2e13e11a3a70528ac7759452fd8b77b53e1ece81e4cfbda3ca
font_01_sfnt_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 11012 bytes
SHA-256: 549b207fc3a7b512ee4ec503c4d63ab0a2254a150f587121769c95682813bda0

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