Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f452d56559435c…

MALICIOUS

PDF

73.7 KB Created: 2021-03-07 08:26:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6d417c33b86734b72a48d278ecf78972 SHA-1: 279661d742ae9ecc36a84696ecaf174c9d83aff5 SHA-256: b5f452d56559435c3eb90517b410d1c33b4e9c5b597a3dec825765c2eb840b06
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://resalured.ru/strik?utm_term=what+is+heat+of+fusion PDF link annotation
    • https://cdn.sqhk.co/rilowikapaz/iejcjd6/game_online_cat_simulator.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/djIuAhf/drift_zone_2_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tesigasefaxe/gjegeyL/xowogurosubibabozonavul.pdfIn PDF document text
    • http://naykaryadom.fun/82512254125j0a75.pdfIn PDF document text
    • http://repair-kompov.ru/zokozepegumaposusugufv4ulp.pdfIn PDF document text
    • https://cdn.sqhk.co/gumorefose/hiihjez/this_war_of_mine_switch_dlc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_5fd907103f1f9.pdfIn PDF document text
    • https://cdn.sqhk.co/kisudosus/fYXnRaK/bisefosawatano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_60111a7361012.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/225fd352-b520-4729-b14c-7b9f7c9a527d/1979987560.pdfIn PDF document text
    • http://fupisetugib.rf.gd/mutotamojikok.pdfIn PDF document text
    • http://setetutimuwux.epizy.com/8603660799.pdfIn PDF document text
    • http://zupotid.epizy.com/knight_rider_music_sheet.pdfIn PDF document text
    • http://sarovagovoz.rf.gd/is_nikon_d5200_a_good_camera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02c57251-e744-4686-be98-8c15da3d90dc/menorovezap.pdfIn PDF document text
    • http://zalerifi.rf.gd/22614052664.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_off0000e2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F5 4740 bytes
SHA-256: 650e05736abfd0c746286152d261e3ddcd9f6075385a1ca721aa1f8e3b331175
font_01_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 11572 bytes
SHA-256: 079115bf9a520eabc27ae611bb6b1404a15fc0709d7c3a82ec1528364f229d5a

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