Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fc338dcc520499…

MALICIOUS

PDF

82.0 KB Created: 2021-04-17 18:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 77da592172081e2e30c4d6ca43f54e6c SHA-1: 75588814e488194669d5603c3277ccaa96f3cf46 SHA-256: 19fc338dcc52049927f2296a48cd7058e9b170e6caa8901934662e35f22370a2
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The primary malicious URL, 'https://jottigo.ru/strik?utm_term=how+to+open+a+timex+indiglo+watch', is presented in a way that suggests it's a search result, likely to trick users into clicking. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://jottigo.ru/strik?utm_term=how+to+open+a+timex+indiglo+watch PDF link annotation
    • http://dedigevobunobe.medianewsonline.com/vexovejewof.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/gphdgfV/flip_water_bottle_challenge.pdfIn PDF document text
    • http://wuledorifik.22web.org/xivorofoxulavanudog.pdfIn PDF document text
    • https://damitonamusu.weebly.com/uploads/1/3/4/3/134306925/6181468.pdfIn PDF document text
    • https://cdn.sqhk.co/jinuminex/nibibib/budget_plan_format.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/fesesinuzisaxujizo.pdfIn PDF document text
    • https://nifevokore.weebly.com/uploads/1/3/1/4/131437532/lujirapamadapev.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/muvazi/aao_na_kabhi_haweli_pe_song.pdfIn PDF document text
    • http://wevikokuzufos.epizy.com/abhimaan_songs_mr_jatt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fd63174-900e-4d09-8da7-6b32cf41d528/40619263950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a90bae0c-9e9f-4488-abe8-f737b52e0338/how_can_i_help_my_child_academically.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/texas_instruments_ti-30x_iis_scientific_calculator_instructions.pdfIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/hisaye_yamamoto_seventeen_syllables.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/80573872928.pdfIn PDF document text
    • http://resilasijajatil.myartsonline.com/talk_like_ted_carmine_gallo_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22759519-0ff3-442c-b63e-c8050c3a0eba/92118118111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed55ddab-101d-40e7-a8ea-371e39d48a85/how_to_install_drum_kits_fl_studio_20.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_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 5124 bytes
SHA-256: d6c91113a9e41c319caf6354f20dd816d25a76e4deeb1aeac79c51115f72ba85
font_01_sfnt_off000108dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 10348 bytes
SHA-256: b7ab710783906d5f59cc063f69d712c7a1c6a9235d2d8bd463ded5da9fcaa1a1
font_02_sfnt_off00012c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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