Malicious PDF — malware analysis report

Static analysis result for SHA-256 9138e8cf49d5ad8c…

MALICIOUS

PDF

76.5 KB Created: 2021-02-27 04:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 84e5eff54d59da9c5c574d11b136ae0e SHA-1: b72a7cb2708bd726beac1f6cc323043c5829d8fd SHA-256: 9138e8cf49d5ad8cd58b4fd05f2fd9290dcaadf0d4c8980699b50d19c9a5b4ed
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://dafemum.ru/123?utm_term=1992+mercruiser+4.3+oil+capacity PDF link annotation
    • https://cdn.sqhk.co/gisatajofo/ihLjaih/airport_body_scanner_radiation_dose.pdfIn PDF document text
    • http://manipiso.iblogger.org/ti_86_manual_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/IvIghhi/sivasapuvidimo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491671/normal_5fce99eb4f5d7.pdfIn PDF document text
    • http://sallehub.xyz/why_does_mercutio_and_tybalt_fight3a7d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426267/normal_5fced0b4427ed.pdfIn PDF document text
    • http://geekcods.com/tofevikomipipojuvuzufebamuf6ox.pdfIn PDF document text
    • http://mebelrostov.ru/does_the_magicians_tv_show_follow_the_bookhkr04.pdfIn PDF document text
    • https://cdn.sqhk.co/soxobiwefili/mkjfgjX/pvpets_tank_battle_royale_apkpure.pdfIn PDF document text
    • http://trend-sales.fun/41379540991l5d42.pdfIn PDF document text
    • http://nat-fru.space/como_cambiar_el_tipo_de_archivo_de_un_video_a_mp3mm5da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://torumotone.rf.gd/39015173060.pdfIn PDF document text
    • http://lopejad.epizy.com/outlook_for_mac_free_busy_information.pdfIn PDF document text
    • http://wamilexujiweni.epizy.com/how_to_explain_a_mothers_love.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/dazn_italia_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/42244639503.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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 5484 bytes
SHA-256: 73752d603a0f24830cc2285c8889c10ebb8a29af5c220b8eb78cc6d420de392b
font_01_sfnt_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 10800 bytes
SHA-256: 477503d1e3fa8511a86cfeef0d70a7164715f84e527224c9810bee71245da876
font_02_sfnt_off00011638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11638 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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