Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e9b072daae7cdb…

MALICIOUS

PDF

84.6 KB Created: 2021-03-01 06:42:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9490af1129413e0fa6fe5509f3e7c087 SHA-1: a698263f3a9f4a0b8fc2b63d49c923f35de74ef1 SHA-256: 51e9b072daae7cdba76889a609ba430918a5c33bd636ef72a7b2a0c5840d425e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable hosting domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

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://ponafet.ru/wix?keyword=sequences+practice+worksheet PDF link annotation
    • http://virutimi.22web.org/37623106906.pdfIn PDF document text
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/fetisulal-wemuboxuruv-wuvepegan-bufedezozet.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/hcghhiF/face_mask_detection_using_tensorflow_and_opencv.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/ho2Cnhh/magic_fluids_free_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/djjiib4/empires_and_allies_download_for_pc.pdfIn PDF document text
    • https://zisirusezudi.weebly.com/uploads/1/3/4/8/134846547/978aca0db8127.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/49730530191.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zujitix.epizy.com/ariston_washer_dryer_arm7l105_manual.pdfIn PDF document text
    • http://davofunup.onlinewebshop.net/28939766250.pdfIn PDF document text
    • http://wikatamuk.rf.gd/star_trek_discovery_season_3_episode_8_online.pdfIn PDF document text
    • http://fiwisarevuril.rf.gd/free_intermediate_cello_sheet_music.pdfIn PDF document text
    • http://wijuromosumeko.rf.gd/dell_poweredge_r730_drivers.pdfIn PDF document text
    • http://mopezit.epizy.com/dragon_city_heroic_race_breeding_guide.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/jijakunivugufexasi.pdfIn PDF document text
    • http://jafesok.epizy.com/snow_white_and_the_huntsman_cast_and_crew.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/gufub.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_off00010da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA0 5372 bytes
SHA-256: 501dcc2d21ce4599042d3a65bc968086c1a4e1b48ba4ec629eda58d8ee5aa799
font_01_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 11016 bytes
SHA-256: 6ae72bf6fd05cbd5a7c504e2b8efe54370ecbbdd4046fb81d76177959a973033

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