Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8403bbf91d7312…

MALICIOUS

PDF

74.5 KB Created: 2021-03-08 05:04:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7aab006886a912c188cac50e4750ae8f SHA-1: 88e9d05e6f4ef653c895242e8c4375d260e5a3fa SHA-256: 9c8403bbf91d73124274d52cad773b1ef15f2afb3aef8e59f4c6cbdfcdb82373
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

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://baarspo.ru/strik?utm_term=powermax+atv+reviews PDF link annotation
    • http://twitter-center.com/wizardry_6_automap_modn0hm9.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/DigHer8/strategy_games_online_unblocked.pdfIn PDF document text
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/kefivabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_60163571824de.pdfIn PDF document text
    • http://pokupka.space/dafotr1t1h.pdfIn PDF document text
    • http://onlinekartiadesi.com/diablo_3_nintendo_switch_crossplay4pr05.pdfIn PDF document text
    • http://workbykoder.xyz/38587385465z2kaf.pdfIn PDF document text
    • http://vkrowl.com/fezewolopotibiseziap3n9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447640/normal_5fffad06d93da.pdfIn PDF document text
    • https://cdn.sqhk.co/tawunipufop/hcii6ib/58097705657.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/3c6529ff4410a8.pdfIn PDF document text
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/8241744.pdfIn PDF document text
    • https://pabifiliponisod.weebly.com/uploads/1/3/4/3/134367040/2f6bab13879130.pdfIn PDF document text
    • https://sozezitevi.weebly.com/uploads/1/3/4/6/134639304/47fcd975.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/hWjdigi/totally_accurate_battle_simulator_modern_mod_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494875/normal_6004cacf2cacf.pdfIn PDF document text
    • https://cdn.sqhk.co/warugariluxe/hhjhih7/management_fundamentals_robert_lussier.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/49833742686.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/nopuju.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off0000e4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C5 5020 bytes
SHA-256: 53c03ec70a020a885811cf923a8035cc3989db810d392b54cee2679a110215e7
font_02_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 11432 bytes
SHA-256: 524fc674ac0e1af0137ce97319cd036b008beba4ea09c20f6ddef944c73fc6d8

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