Malicious PDF — malware analysis report

Static analysis result for SHA-256 7714eea2e3597c25…

MALICIOUS

PDF

79.8 KB Created: 2021-03-11 15:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 80eddf1805ae59e60adf5c38a56fcfe6 SHA-1: 14f79d8a866f60e232f908db8e8cb89f3bd85082 SHA-256: 7714eea2e3597c252317b341b3d73c9529db26048a8165b063483aff4abec4d2
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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=national+geographic+books+pdf+download PDF link annotation
    • https://cdn.sqhk.co/satofapo/hehixMR/infection_control_nurse_role.pdfIn PDF document text
    • http://podjem2.club/famous_short_essays1b71s.pdfIn PDF document text
    • http://zetomanebegox.iblogger.org/76489804871.pdfIn PDF document text
    • http://haifaiv.ru/wosisuret1wdon.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/jfgeQjc/wetovobafiruper.pdfIn PDF document text
    • http://trokot-shtorki.online/39569052699b6ph4.pdfIn PDF document text
    • http://fumuponi.22web.org/decomposition_of_functions_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzaxepigi/bQKIgdk/cabela_s_big_game_hunter_2006_language_change.pdfIn PDF document text
    • http://yoganchik.space/841861262130zla.pdfIn PDF document text
    • https://cdn.sqhk.co/sefesolos/VDqidif/36913055682.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/SxM7zhG/kufivokafanozonoma.pdfIn PDF document text
    • http://tigitaja.iblogger.org/75892995939.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
    • https://s3.amazonaws.com/palikuvexake/gobitubifusaki.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/fiserekedarilasapezumob.pdfIn PDF document text
    • http://gametusepezuka.rf.gd/zonevemaripumijarel.pdfIn PDF document text
    • http://wewenak.rf.gd/vekuruxixowuz.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/75633373804.pdfIn PDF document text
    • http://fogivezin.rf.gd/savubukifigudageluko.pdfIn PDF document text
    • http://ramupamotolaj.epizy.com/jandy_pool_pump_valve_settings.pdfIn PDF document text
    • http://farapatenaru.rf.gd/gaxexisogiwosotupas.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/68182881598.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/51147062223.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_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 5468 bytes
SHA-256: a79540cbc867b68531dfcca043f42df832a5225c122a3052e82460ed4ce0be87
font_01_sfnt_off0000ff94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF94 10396 bytes
SHA-256: 764fbc6d1254d0e427fc57ecd88164bd41dac902466d856e3706442945ab84d2
font_02_sfnt_off00012304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12304 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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