Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d4145c65498b8d…

MALICIOUS

PDF

73.7 KB Created: 2021-04-17 21:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6fcf9b912e074f94392da63f115fda6e SHA-1: 949546043307c24dcf4f6ba0d15dee6495103af6 SHA-256: 38d4145c65498b8d68f3a8e7945140f94ffac0812788be86b3c648085b4ab702
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://xajibur.ru/strik?utm_term=how+to+use+treadmill+at+planet+fitness PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374199/normal_601e8a553cb14.pdfIn PDF document text
    • https://saselafe.weebly.com/uploads/1/3/4/8/134894966/1086159.pdfIn PDF document text
    • https://lukujoluge.weebly.com/uploads/1/3/4/8/134864233/tesumudutaz_bumozozijaxobox_leviwup.pdfIn PDF document text
    • https://femuketidoxesi.weebly.com/uploads/1/3/3/9/133997502/denatubotunegiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468819/normal_5feeaba13b861.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379720/normal_60021844c5e55.pdfIn PDF document text
    • https://cdn.sqhk.co/safimowexaw/rjjFAmQ/naughty_boy_runnin_lyrics_beyonce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472501/normal_5ffeb35169391.pdfIn PDF document text
    • http://idealicaitaly.site/xasagetozapejanasre4t.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxezitowefi/ehagjih/s_photo_editor_collage_maker_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/jdJtrUf/bgn_launcher_premium_apk.pdfIn PDF document text
    • http://bred-enligne.com/59156264117yiwgw.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/7a90adfa-73d0-4a9f-9660-a52c77ac13d8/dimoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/483a8d23-59f6-4bdb-930e-aa8cf5e31842/how_long_to_read_a_400_page_book.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_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 5240 bytes
SHA-256: d18f71bb6e2de9bc90478aa66611f6af248f901393b57685ccd1164680bd00c5
font_01_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 11372 bytes
SHA-256: 6190f02a2652d7c65dab7416e8f5d8b38de4155cbe91c2028c8eb04412347ab5

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