Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5d899d1894cbf4…

MALICIOUS

PDF

78.1 KB Created: 2021-06-06 18:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 84f2156547c38f661e994e1355a3b61c SHA-1: 6fa6dc8fd8e359c1b994f7c471096ce61b258bb2 SHA-256: 9c5d899d1894cbf498005e55a33e3191510e0288c86c42860510b27f9a83be07
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 0.9991

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://nomylo.ru/pbw?utm_term=free+fire+hack+mod+apk+download+unlimited+diamonds+and+money PDF link annotation
    • https://pafufido.weebly.com/uploads/1/3/1/4/131407890/gopiti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457592/normal_605420bdb0347.pdfIn PDF document text
    • https://rigefenasoje.weebly.com/uploads/1/3/0/7/130776330/gimavove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410433/normal_605d71a132d6f.pdfIn PDF document text
    • https://wuzitefagoxu.weebly.com/uploads/1/3/1/8/131856046/saropolaza-verifabefudotat-fimewapakik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_60476bac53771.pdfIn PDF document text
    • https://danenogamapan.weebly.com/uploads/1/3/4/4/134481258/sepefupulisonufibike.pdfIn PDF document text
    • https://lowujowe.weebly.com/uploads/1/3/5/3/135320741/jireberipuso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481663/normal_5fd09cb134ec3.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/pegurex_rikixomowikogot_tesewarirupa_wedasexike.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/tegunilatetibagezub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuxikadafi.pbworks.com/f/how_to_use_swingline_electric_stapler.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/w/file/fetch/144462858/28039374048.pdfIn PDF document text
    • http://laxaxufudej.pbworks.com/f/9917598046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8ee2f09-16c5-4563-bb4b-f8d01b30116c/how_to_cite_poems_in_mla_8th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c241c7bb-df4d-4de7-ac6e-d41cd7be280f/13709998492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ba5ff9-3344-4a55-96f0-cefa9ed6982c/software_detailed_design_document_template.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/75110551893.pdfIn PDF document text
    • http://povelin.pbworks.com/w/file/fetch/144663585/dominion_power_bill_high.pdfIn PDF document text
    • http://pidexuxok.pbworks.com/f/siriva.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/f/free_printable_lesson_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e42e3290-86c3-4b4a-a074-260907f2fcec/20622803317.pdfIn PDF document text
    • http://dekokos.pbworks.com/f/finozivozotegol.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/stick_fight_archer_mod_apk_unlimited_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c92fa33-c7aa-4d79-bf13-054a5d8f9ae0/lomesefidefavofomu.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_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 5608 bytes
SHA-256: 6d4ccba22b30c42e02226cbd538ccb76dec26ab6670b5da77ba7f77041d4d274
font_01_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 21964 bytes
SHA-256: 1c8716bfe416e6e2f8b1f1b03c5e4983cef803db77c01be6779cd86685e85ebe