Malicious PDF — malware analysis report

Static analysis result for SHA-256 56162da00e3f9c2d…

MALICIOUS

PDF

76.3 KB Created: 2021-04-01 11:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 04645467ee142a7d60bea1bb69afda8a SHA-1: 6625e0fc829c8d1a5b190d52ae20ff5a6448b199 SHA-256: 56162da00e3f9c2d416528a3492da1a8524df09ce4620858bd9bf48754b43b51
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document, disguised as a budget sheet, contains numerous embedded URLs pointing to potentially malicious domains. The ML classifier strongly indicated maliciousness, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the true nature of the links. While no scripts were directly extracted, the presence of external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://fokemale.ru/123?utm_term=monthly+budget+sheets+printable PDF link annotation
    • http://relax35.ru/coleman_powermate_3000_generator_partsb5xhb.pdfIn PDF document text
    • http://usacreditreport.info/aiag_fmea_manual_free_download55wod.pdfIn PDF document text
    • https://fonutupo.weebly.com/uploads/1/3/4/7/134727000/pevajodesajutuw.pdfIn PDF document text
    • http://gobigs.space/report_abandoned_car_aucklanddsi0a.pdfIn PDF document text
    • http://nesobaka3.xyz/chhaila_bihari_ke_bhojpuri_gana_video_ingdtiip.pdfIn PDF document text
    • https://cdn.sqhk.co/tupulezi/cgdjijd/knockdown_ceiling_texture_sprayer.pdfIn PDF document text
    • https://cdn.sqhk.co/muzorefu/DjbgXhh/kipunufaval.pdfIn PDF document text
    • http://molotkov.site/59961112995ovx0c.pdfIn PDF document text
    • https://xulomonixibeneg.weebly.com/uploads/1/3/1/4/131455416/movolivuxi.pdfIn PDF document text
    • http://gmetry.online/vasebiwotutivakopugexasiy4f.pdfIn PDF document text
    • http://handler-autoscout24.com/11060668964vi6a2.pdfIn PDF document text
    • http://fresh-ita.space/puch_stickman_rope_hero_2_mod_apktlz93.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/5142e926f4639.pdfIn PDF document text
    • https://totibevopomuv.weebly.com/uploads/1/3/0/8/130813722/bisewarilibigosat.pdfIn PDF document text
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/66945.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/punagilelabon/samsung_uhd_tv_6_series_55_inch_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5c2292-4109-4a78-9d7c-3b9490aa9961/bazevisesewitononuka.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/jaspersoft_studio_report_expression.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/298fdcc2-3c1f-480c-bc73-0cb333e06f68/red_rising_movie_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/what_does_lack_of_quorum_mean.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_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 5468 bytes
SHA-256: c5d01e9aa63977923748104ea06a84f8189989e541823ce6eebeec3384832110
font_01_sfnt_off0000ff06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 10828 bytes
SHA-256: dcb065bc421292839920840020c47e5be4ffec8b59a8c280409f71ebdbc6d2f3

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