Malicious PDF — malware analysis report

Static analysis result for SHA-256 b313dda8e84e6e8c…

MALICIOUS

PDF

73.5 KB Created: 2021-03-04 09:07:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 46f13005e53a2d11653d6173f1497d7b SHA-1: 12041f416c2e6675d796cf06fd40bfbff7715ec5 SHA-256: b313dda8e84e6e8c1175d7dfc9f6c4f161b1f5617e6b617fcffd6e91201dd7e4
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 0.9999

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://midufefew.ru/wix?keyword=demand+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/lakarejof/jjmjcPm/tolavatiwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443354/normal_5feea473c99c2.pdfIn PDF document text
    • http://shopsupergood.site/jewiwapasiysh8t.pdfIn PDF document text
    • http://goldalbum.ru/how_to_unlock_whirlpool_duet_front_load_washernwvyc.pdfIn PDF document text
    • https://mesakejaj.weebly.com/uploads/1/3/4/7/134754162/ratiwarekafisadeka.pdfIn PDF document text
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/nawixanepejej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415080/normal_5fd2e21b9a447.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/diahbii/mini_games_zombie_online.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/6hfipge/roblox_support_number.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/UjhgfpG/jetasutibofolopikonir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459777/normal_603fd2497a800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447658/normal_601a4769848f1.pdfIn PDF document text
    • https://nuguviroguzemek.weebly.com/uploads/1/3/1/0/131070089/zogoreromilo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sudimomovaw.epizy.com/jekoxivoxumepipuvababa.pdfIn PDF document text
    • http://gevovedejege.epizy.com/5793745651.pdfIn PDF document text
    • http://sakupoje.epizy.com/63433607060.pdfIn PDF document text
    • http://vetavewolo.epizy.com/call_of_duty_modern_warfare_pc_requirements.pdfIn PDF document text
    • http://povuputuk.epizy.com/zixobinada.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_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 5288 bytes
SHA-256: e0cff9d67912f85cfebb0f894f522c734ba6d725436c9d06d370c13d7128cd6f
font_01_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 10712 bytes
SHA-256: 9253d00a06104046328519b20963269d2f720a9998af2e26a62a21e8d0bde213

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