Malicious PDF — malware analysis report

Static analysis result for SHA-256 b194950f7dc8c203…

MALICIOUS

PDF

73.8 KB Created: 2021-02-18 20:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a9e85368c826ee79a97a2e6f2235482f SHA-1: dda948186ba92d7718f3e03a41a8daffd5e53304 SHA-256: b194950f7dc8c203bc56727306e1f902b54036ff7c7dc7918059a0e5317ff35c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites for further exploitation or credential harvesting.

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://bologen.ru/wix?keyword=elasticity+theory+applications+and+numerics+pdf PDF link annotation
    • http://amandeepsadyora.com/tiwapulupegaxisudaredikipohygz.pdfIn PDF document text
    • http://widokig.iblogger.org/consumer_reports_external_vacuum_sealer.pdfIn PDF document text
    • http://1xbets-regs.site/27638326634apgvj.pdfIn PDF document text
    • http://volosaty100.xyz/gis_software_free_mach96hs.pdfIn PDF document text
    • https://fozibopabedabe.weebly.com/uploads/1/3/6/0/136082219/7a9d30.pdfIn PDF document text
    • http://blaugrana.ru/zmodo_doorbell_camera_manualchc65.pdfIn PDF document text
    • http://subbellassecret.com/967142609999m41y.pdfIn PDF document text
    • http://arenaprobet.com/miragine_war_unblocked_games_at_schoolaqlgs.pdfIn PDF document text
    • http://kinokaiff.space/84935072856ek3q3.pdfIn PDF document text
    • http://eliyalte.com/mirtazapine_for_dogs_with_cancer8buey.pdfIn PDF document text
    • https://berafakeje.weebly.com/uploads/1/3/4/0/134000448/jikipevilewe.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
    • http://gupexofuvesok.epizy.com/fancy_text_app_android.pdfIn PDF document text
    • http://favirivesez.epizy.com/54226689305.pdfIn PDF document text
    • http://nabiderafiwo.epizy.com/pefafevasepakikaretuvilu.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/microsoft_dynamics_365_certification_exam_preparation_guide.pdfIn PDF document text
    • http://zonidagaxa.epizy.com/android_architecture_components_basic_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/92571443559.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_off0000d696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD696 5336 bytes
SHA-256: 66464ac5d730833b3cddbea07218f5232f26a12a486ad3c9ff2860da528e20ca
font_01_sfnt_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 10284 bytes
SHA-256: a88e7f89e5fff568fee3349dbe0553acc3e38400c0369f7ad67bdc94548c2c94
font_02_sfnt_off00010bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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