Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab338c14695f0ab…

MALICIOUS

PDF

76.3 KB Created: 2021-03-02 06:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 34185c48114e1007aa80c6881bc4d7f0 SHA-1: 911ab86c6460549f95856324f9f15b24a17b86f9 SHA-256: 3ab338c14695f0abebb162848853bffdc33d0df8dbcda5d252d46dab4b168327
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=bissell+spot+clean+proheat+pet+cleaner PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455197/normal_5fee5492a07fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366000/normal_5ffefa854cb83.pdfIn PDF document text
    • https://bekariniwoxisit.weebly.com/uploads/1/3/2/7/132710774/8738023.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/powerex_mh-c9000_manuale_italiano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495254/normal_5fd6b089719d1.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/3340398070.pdfIn PDF document text
    • http://virilibag.66ghz.com/last_version_of_whatsapp_plus.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/8231846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467038/normal_60330b506bbc7.pdfIn PDF document text
    • https://fanazogi.weebly.com/uploads/1/3/0/9/130969494/ginezufemefuso.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/xifun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481155/normal_6002bd87c1605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451039/normal_5fdb3ac160d9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/ragekajaxiwele.pdfIn PDF document text
    • http://ruvaseravijuged.rf.gd/sumawobeworuduxesib.pdfIn PDF document text
    • http://bajewilogofiro.epizy.com/big_sur_jack_kerouac_summary.pdfIn PDF document text
    • http://zawomebi.epizy.com/model_cerere_concediu_odihna_2017.pdfIn PDF document text
    • http://jexukavelewin.rf.gd/how_to_cook_a_spiral_ham_in_an_oven_bag.pdfIn PDF document text
    • http://vevosewis.rf.gd/28697686899.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_off0000ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 5068 bytes
SHA-256: 2f6662319a6b436f25b30e8abcb44ba429900261c810d16db6974b1e4e5657b3
font_01_sfnt_off0000fd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD12 10936 bytes
SHA-256: 78d492204c9cc2818d867c2e55a0bfcef26d87083ae59cf08c79fdd32aae6a1a

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