Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d55b5bf0e50ae91…

MALICIOUS

PDF

75.6 KB Created: 2021-04-06 19:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 10e5a915b2a1ae70bc71235c6b311c81 SHA-1: 5053e931655f3302e5e0fd2175567112e7504dd5 SHA-256: 3d55b5bf0e50ae912d3e4db3691e7740ba4a47525f85acafbd4608ba4f0401a2
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 0.9993

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://dugedepap.ru/award?keyword=hallelujah+sheet+music+piano+free+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369766/normal_604d5c5ac40f5.pdfIn PDF document text
    • http://legendbilisim.com/canon_eos_rebel_t5_manual_espaolsnows.pdfIn PDF document text
    • http://justiciaforjustice.com/google_drive_ready8ygiu.pdfIn PDF document text
    • http://itwomen.space/wrestlemania_at_t_stadium_attendancege4f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375200/normal_6058c68711fbc.pdfIn PDF document text
    • http://regsenatvumen.website/www_gamestop_com_code_redemptionlwlay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445326/normal_6027d1542078e.pdfIn PDF document text
    • http://sinanomi.22web.org/cutting_for_stone_phrase_meaning.pdfIn PDF document text
    • http://idealica-italiaoficial.site/semonikiparavofel7asl.pdfIn PDF document text
    • http://gatiseb.22web.org/gavakoderukiwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_601718d141204.pdfIn PDF document text
    • http://mybestchan.online/topographic_map_skills_practice_sheet_answer_keyono5p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382412/normal_5fff159039f93.pdfIn PDF document text
    • http://redita.fun/inherit_the_wind_act_3kobge.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/hjjbhiw/rizijemamexawirer.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoverol/ihu37hd/zemudusofopu.pdfIn PDF document text
    • http://bigwin-1xbet.fun/dazovirowapu5s8o6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dizutobasuxolom.epizy.com/basic_statistics_equation_sheet.pdfIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_4298e67515ec411ab32c0eb1bacb3427.pdf?index=trueIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_26e5074a827540d7bb90508332609ac1.pdf?index=trueIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_fa163e3dade54848a78f9af40fa3bbfe.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_bdd3d3abf2df402987455089fe01f8d5.pdf?index=trueIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_74c524d086514f9f8c5a23f650b0d8a9.pdf?index=trueIn 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_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 5432 bytes
SHA-256: e31bd2b2bcc50171d2c5465c546b44773dfa89a9bced099f6c064a52eabd1c6a
font_01_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 11140 bytes
SHA-256: 29d648fee6c1e06a7f81eb14e1b0003bff68494d00fe46f3d3689a8f3af5d2a8

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