Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57f359a703f788a…

MALICIOUS

PDF

88.6 KB Created: 2021-03-12 01:17:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 556ce1e55647d592ec752a919611b193 SHA-1: 1638bedcdca9892a76edd87106b4808a9c55bb80 SHA-256: c57f359a703f788acc8f140dc3cb42af634d5b430f8a87c23983c734dd6945b9
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 0.9994

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://kuzutuzo.ru/123?utm_term=kundalini+shakti+in+tamil+pdf PDF link annotation
    • http://chambre.xyz/sezepikvdgl5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476566/normal_60099216c5f83.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/9zCxdgc/free_birthday_video_maker_app_with_music.pdfIn PDF document text
    • http://pezozolagipiv.22web.org/rufofaduwowaweso.pdfIn PDF document text
    • http://webmastervlad.ru/9712018822z2j87.pdfIn PDF document text
    • http://voirly.xyz/70209140521suna.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/eVW4jah/tribal_tattoos_drawings.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/eARngil/nibuzekodefaf.pdfIn PDF document text
    • https://cdn.sqhk.co/vinogusi/ghifii4/vakibuxenezupovibi.pdfIn PDF document text
    • https://cdn.sqhk.co/pesenexur/bpjihEc/78613053109.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/ichfjbb/abcmouse_login_parent.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_5ffb09ac21194.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinipaz/gjcPJhc/wajumuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414164/normal_5fd060525b616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411246/normal_5fdaba9c347a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sezusol.epizy.com/47241525823.pdfIn PDF document text
    • http://gafufumajofoben.rf.gd/78328712140.pdfIn PDF document text
    • http://dukiduzafenej.epizy.com/french_canadian_fiddle_tunes_sheet_music.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 4872 bytes
SHA-256: 9a5594bba79ce80a077dbc2ef3edd49e7c172c74d99caf7a3390b7f91a2b45c1
font_01_sfnt_off00010052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10052 2636 bytes
SHA-256: fc0f4f8641f0aa79468a72ac37c39c7efb7c8332ea76daceb2fd922159fea068
font_02_sfnt_off00010b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7C 10884 bytes
SHA-256: 0e85681ed319a76a3e7b8ef09a5c1798be38f2349d4144c9f5c793351a882516
font_03_sfnt_off000130d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D2 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67
font_04_sfnt_off00014599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14599 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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