Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3187feb641936d3…

MALICIOUS

PDF

85.3 KB Created: 2021-04-01 07:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8989588f3d562920106ed6c89d5acc23 SHA-1: 9d0f19b58ead2c5beb5dffd58441e785d67111bc SHA-256: b3187feb641936d341d056f5083a3a6d6c24d1696911a3e83cdd3347d35e3e51
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 0.9996

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://xajibur.ru/wix?keyword=csusm+sociology+major+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381971/normal_602f41330eb8c.pdfIn PDF document text
    • http://premial.su/penodurl1z7.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/hhbJehi/iowa_80_truck_wash_joplin_missouri.pdfIn PDF document text
    • http://urolog.xyz/90432417889myf2k.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/HgeWXig/singing_in_the_rain_musical.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5fd05dc340ef9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498801/normal_604b690cb746e.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/06ggfgg/black_friday_2020_date_canada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413570/normal_6005f079b7f88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • http://bibibojusajol.rf.gd/dilwala_bhojpuri_movie_comedy.pdfIn PDF document text
    • http://rakijojovisu.rf.gd/bible_commentary_in_malayalam.pdfIn PDF document text
    • http://lubudag.epizy.com/86400186461.pdfIn PDF document text
    • http://mebukaronov.epizy.com/59751123470.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/zagiwake.pdfIn PDF document text
    • http://petetilazuji.epizy.com/charles_kittel_introduction_to_solid_state_physics_eighth_edition.pdfIn PDF document text
    • http://tejojode.rf.gd/zijevuzivobosoxubiravax.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/37384610923.pdfIn PDF document text
    • http://puteroxono.epizy.com/bifuk.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/sinokejijufaxomorov.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 5452 bytes
SHA-256: 0d31e9759c8a00c9ebb71be7baea5b81cf3b901853e1298d72b18ca05112d601
font_01_sfnt_off00010ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 4972 bytes
SHA-256: d57eeb5b2a4dcaed1f1af5b03ccaa0f9223d3672daa6d14433db3b1b66f91561
font_02_sfnt_off00011ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB7 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_03_sfnt_off00012345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12345 10484 bytes
SHA-256: 16514a4bd721699118ce26eb6ea13f06b7b4051502628a7f08f249f0217cbe4f

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