Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a98d84e1844d93…

MALICIOUS

PDF

80.1 KB Created: 2021-03-20 05:56:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 94537a23fd914f9dad479c8f54cc11a2 SHA-1: 59e363f0cec61154bbd031a99c76334d7fa74cff SHA-256: b1a98d84e1844d939358bcda8b30c3dd2563e789e6a7ce2fa8d05e056771072e
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://bologen.ru/award?keyword=hernia+umbilical+cirugia+pediatrica+pdf PDF link annotation
    • http://prechambre.xyz/14548041082oh6ei.pdfIn PDF document text
    • https://wixurawitubeza.weebly.com/uploads/1/3/4/3/134319602/95daaaf1ecc2.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/edgjhhg/hack_zombie_tsunami_ios_chua_jailbreak.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/unVibhi/crusader_quest_guide.pdfIn PDF document text
    • http://daliadiago.com/samsung_rf268abrs_owners_manualkid0h.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/0jihbii/recorder_hardest_song.pdfIn PDF document text
    • http://jofipifemu.medianewsonline.com/daxitugulasubavep.pdfIn PDF document text
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/zurav.pdfIn PDF document text
    • http://quickpapp.online/1994_johnson_150_fast_strike_carburetorvm753.pdfIn PDF document text
    • https://wilemixi.weebly.com/uploads/1/3/0/9/130969959/poxiwo.pdfIn PDF document text
    • http://molotkov.site/77857645145oxnoi.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/hyJgc2c/zedemomunujadoj.pdfIn PDF document text
    • http://jifarobajis.sportsontheweb.net/21733614374.pdfIn PDF document text
    • https://vipavogezeguw.weebly.com/uploads/1/3/1/0/131069860/joxigijixenema.pdfIn PDF document text
    • https://tubidurifubadas.weebly.com/uploads/1/3/4/8/134885002/c5c60dac6f1.pdfIn PDF document text
    • http://stalekost.site/85469461869x55al.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvafinuvewabek.epizy.com/decimals_on_the_number_line_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16cc48ee-c04d-47f4-9c8a-dbdd514f1055/45919983561.pdfIn PDF document text
    • http://xutenasejubibe.atwebpages.com/plant_biotechnology_and_genetic_engineering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f2585f8-f7c9-4059-8870-ae01e12f7df8/cisco_sg200-50p_firmware.pdfIn PDF document text
    • http://kapigazezej.epizy.com/cctv_system_design_software_free.pdfIn PDF document text
    • http://jozilaro.atwebpages.com/luwesonixebitafokajuko.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_off0000fd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 5400 bytes
SHA-256: 8bb56371278e3f5382d048acebb302a962a0de06d8256301b589198e44f2c252
font_01_sfnt_off00010fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 10276 bytes
SHA-256: 70274e1a0440fab8913b1c16803c3f9a23176ed783082e846c6be50aec88a6cc

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