Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0e8e2782c1e2f6…

MALICIOUS

PDF

74.1 KB Created: 2021-02-28 14:09:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f76cfcaa461bdf247059882a6a3b5f96 SHA-1: d03d697b361fc99f7a9f9da796871461963f0d06 SHA-256: aa0e8e2782c1e2f67eed3a94c335c6bda8ab6948d79ac3a8976ef2a3def27cdb
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://jacksth.ru/strik?utm_term=why+is+my+samsung+refrigerator+making+a+noise PDF link annotation
    • https://cdn.sqhk.co/nupumusu/EiiqOhg/treasure_hunters_james_patterson_review.pdfIn PDF document text
    • https://cdn.sqhk.co/kowetitemaro/VzhgAid/mb_baltic_merchants.pdfIn PDF document text
    • http://riliman.22web.org/zezexanaxemofuludizu.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/bhaja_govindam_ms_subbulakshmi_mp3_download.pdfIn PDF document text
    • http://memisada.mygamesonline.org/koleduzuwutuxexula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461219/normal_6037a40c2667b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473056/normal_5fc67a1793285.pdfIn PDF document text
    • https://cdn.sqhk.co/zixajofazadi/igieOrt/47774241225.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372376/normal_5ff7af3047f83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niguroxutoginef.rf.gd/blogs_de_libros_gratis.pdfIn PDF document text
    • http://gezogiz.epizy.com/45926278395.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/delta_crib_4_in_1_white.pdfIn PDF document text
    • http://belibivizonojo.myartsonline.com/how_to_set_an_armitron_all_sport_watch.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_off0000e4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AF 5328 bytes
SHA-256: 122fbbe486793a247b946977f92cd244f5b11f75022860e158f22cd169f185b8
font_01_sfnt_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 10664 bytes
SHA-256: ebbcfbd81bae7b97ff81d75af7b957b30f6157acddea28d47f42b9deaf895a7d

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