Malicious PDF — malware analysis report

Static analysis result for SHA-256 94426aca371c6ea4…

MALICIOUS

PDF

78.9 KB Created: 2021-03-16 00:10:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9e46ff6210b68d4c45785799b9867d72 SHA-1: 2869208f69130c43ccb05e99e4807c89bf68651e SHA-256: 94426aca371c6ea4d22957e34182a757917c23c02bf1afb87f952c65b9ebf45b
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 0.9998

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/strik?utm_term=rounding+numbers+worksheets+with+answers+4th+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451955/normal_5fe69c8e42ad8.pdfIn PDF document text
    • https://gidisapawifo.weebly.com/uploads/1/3/4/6/134611794/xuxujejipivo.pdfIn PDF document text
    • http://blue-tick-central.com/yamaha_rx-v577_dolby_atmosqq6pa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422134/normal_5fdf304e10122.pdfIn PDF document text
    • http://mscgis.net/dajipakemolejanemu6vnp5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463559/normal_60214f0587230.pdfIn PDF document text
    • https://gunisuzafi.weebly.com/uploads/1/3/4/3/134311694/4cbb5403989833.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/cafeteria_management_systemnasnb.pdfIn PDF document text
    • http://muvubaziforobe.iblogger.org/2755967272.pdfIn PDF document text
    • https://sovonasu.weebly.com/uploads/1/3/1/4/131407222/nutoweripu-zujimozivasu.pdfIn PDF document text
    • http://genoray.pro/aliexpress_hair_reviews_south_african7t5k.pdfIn PDF document text
    • http://pasendapp.online/examples_of_financial_statements_analysis_reportw7ot2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_6037e6707fd29.pdfIn PDF document text
    • http://naturapple.space/688675238605rm5j.pdfIn PDF document text
    • http://tasezupu.22web.org/95352502894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482645/normal_604387cb190a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nosodete.epizy.com/69238740965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4970bd80-76b0-4c3c-a3a8-ed512a272b92/pavel_tsatsouline_kettlebell_workout_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af6fde9-57e8-488e-8960-3a39f3a62c71/kejebawolumejilivokuwukad.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 5596 bytes
SHA-256: 1da314ae040c27ce60c022ca6e7074978812712b083509e65bc6112ed5b06629
font_01_sfnt_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 9988 bytes
SHA-256: e54c8c27d1f42a9d091f776dee9a4330eed8c3ad0309a58b20c865353cfe0bdf
font_02_sfnt_off0001187b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187B 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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