Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa426b7e02818040…

MALICIOUS

PDF

81.1 KB Created: 2021-04-27 20:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b107dcc34ebef897aaeb47c9a5262a24 SHA-1: a93b7150387e858f568f85c9a428f7fccad8a3fd SHA-256: fa426b7e02818040bac05db14707d4089f7e0e664c19b2b6ccbdf9f1e8f7e5d0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=what+is+an+acceptable+mtbf PDF link annotation
    • http://7evenrp.ru/57247379452iz8mw.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/faidjan/chess_play_and_learn_apk_premium.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/hfhcjc3/kajonivoxadegan.pdfIn PDF document text
    • https://tazojowilojema.weebly.com/uploads/1/3/1/4/131406386/e8c665.pdfIn PDF document text
    • https://cdn.sqhk.co/kizulajeli/t9wjayy/arcformhoz_ill_haj.pdfIn PDF document text
    • https://cdn.sqhk.co/wozepefiga/diaxjim/gagajo.pdfIn PDF document text
    • http://m-ryanaf.site/37578876603962ev.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/wvgefif/backseat_ari_lennox.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/MhgbhiF/70219323793.pdfIn PDF document text
    • https://jozitosada.weebly.com/uploads/1/3/4/3/134325699/8580132621e.pdfIn PDF document text
    • https://vemetufubejukat.weebly.com/uploads/1/3/4/3/134367776/901741.pdfIn PDF document text
    • https://senejudav.weebly.com/uploads/1/3/5/3/135348848/kopakutizitotiginop.pdfIn PDF document text
    • http://asta-stroy.ru/business_proposal_sample_letterp3k4x.pdfIn PDF document text
    • https://cdn.sqhk.co/zajujinul/gfiiqjj/realm_defense_epic_tower_defense_strategy_game.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/f88c9ea9-d304-4cb2-8880-ecf5a7710e07/reloj_hombre_g-shock_ga-100-1a4dr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ecd9326-9d45-4995-851a-44bf3300f0d2/how_to_connect_xfinity_modem_to_smart_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e2fea21-7f06-49f7-b7cd-8ab3451d08fb/91797278560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9008fb48-04a4-4ae8-9f05-ac7ff7673f2d/78891138133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f24fcd-6e0d-4c1b-b696-1882a3eeefdd/gezesugusovonaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f24a25d-6331-400b-b5cf-283324d524f4/hp_probook_6550b_battery_part_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b847e3e-41f8-4733-ae51-fa6fb5b276ce/how_much_is_a_mister_car_wash_membership.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_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 5312 bytes
SHA-256: a7d68109b882a63ef069096917b2d36e601c21af5ec886eb33f2753e541a144c
font_01_sfnt_off00011137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11137 11052 bytes
SHA-256: 5265f6fca72a16173d0eae7e4578568f248b42786c72aa0645d0fe7b8b2301f3

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