Malicious PDF — malware analysis report

Static analysis result for SHA-256 853ff9cdb374c3e7…

MALICIOUS

PDF

65.6 KB Created: 2021-03-23 16:06:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b8b271a3162ee6099df613abe21f25c8 SHA-1: 86d1271494d55fddee0516d215104da7927ce9db SHA-256: 853ff9cdb374c3e75fc2c426c1ce9fc22bf9fb96e01ce20238540dfbad613d80
126 Risk Score

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://pelibifir.ru/wix?keyword=est+cdr-3+coder+manual PDF link annotation
    • https://cdn.sqhk.co/sadoburola/bhhigje/unduh_kiko_run_mod_apk.pdfIn PDF document text
    • http://muxoman.mygamesonline.org/10137631421.pdfIn PDF document text
    • http://purpless.vip/40201943962cvkj7.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/gdxgaib/ships_simulator_game_pc.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/cambridge_university_press_catalogue.pdfIn PDF document text
    • http://wofefudolojet.mywebcommunity.org/capacitores_electroliticos.pdfIn PDF document text
    • https://nusisudarebo.weebly.com/uploads/1/3/4/3/134349377/c76c65ea5.pdfIn PDF document text
    • http://supportcopyright.net/773017060139swi0.pdfIn PDF document text
    • https://felilediwifagid.weebly.com/uploads/1/3/1/4/131453780/2574845.pdfIn PDF document text
    • https://sifegofariwe.weebly.com/uploads/1/3/1/4/131437131/1702621.pdfIn PDF document text
    • https://cdn.sqhk.co/wamamuli/bieUmjf/90095881845.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/kuxuxemu/mathematics_logic_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/android_tv_version_8._0.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/30681231679.pdfIn PDF document text
    • http://jatugeset.atwebpages.com/the_pit_and_the_pendulum_setting_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/tcp_ip_illustrated_volume_2.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/newsletter_templates_for_word_2007_free.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/9669003437.pdfIn PDF document text
    • http://gixufedexakav.atwebpages.com/xuzuwopamati.pdfIn PDF document text
    • http://pikaderobiw.atwebpages.com/lebenefiwewenefo.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_off0000c489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC489 5236 bytes
SHA-256: 11637fb1df2bbab3e5c4dbcd79117c83ea0724c0d0b7e6c0498ad4fbf8a91455
font_01_sfnt_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 9844 bytes
SHA-256: 1aa221393553f00e82a379c31a1fdc879cde392e002e7d1290ee4d16d39667f1

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