Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ae5ec8b9da7b35…

MALICIOUS

PDF

77.4 KB Created: 2021-04-01 07:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 69c852ac5cf46eeb0c85c096c6080abc SHA-1: e9f1cb04d55d2462f38fb28c289948b497ff34e9 SHA-256: 91ae5ec8b9da7b3526a4679aea92a4be555de27ad45bca873a9b163562bc4956
166 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains multiple suspicious links, including an invisible link to http://com-login8.xyz/w3schools_bootstrap_tutorial_freerhf9a.pdf, which is part of a link farm hosted on disposable domains. The PDF's structure and embedded links suggest it is used as a lure to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://nipisod.ru/wix?keyword=dewey+decimal+number+for+video+games PDF link annotation
    • https://cdn.sqhk.co/kinanekoxo/Rpwdiaz/movie_maker_app_for_android_phone_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/837idWL/32455068920.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/bgimVjf/62697942064.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/XvgdKJr/bakugan_fan_hub_android.pdfIn PDF document text
    • http://firstreadersclub.com/kivisevuromorifasowoggxj15.pdfIn PDF document text
    • http://com-login8.xyz/w3schools_bootstrap_tutorial_freerhf9a.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/ijjgd0A/folofijefupelokasufigu.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/gijjge6/civilization_3_expansiones.pdfIn PDF document text
    • http://infonewsuk.site/automobile_engineering_vijayaraghavangyfp7.pdfIn PDF document text
    • https://cdn.sqhk.co/gojogefe/hbjeha7/dope_wallpaper_hd_iphone.pdfIn PDF document text
    • http://muzoc.xyz/47647665195f8jo8.pdfIn PDF document text
    • http://bet-info.ru/muvuxivxu3t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a29d02fd-6b36-4d0d-84a9-bfd92dc3656d/the_wind_in_the_willows_musical_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3597ee60-d802-48ca-a674-fb9ebadeb0c9/gevozamajukagulixomoduwe.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/56052465654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce5f0440-c6ac-4e78-b35e-27438f82ad2c/what_color_compliments_light_mint_green.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/77612185257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeb88953-7687-4abc-b3a7-1684965cef0b/matematica_financiera_interes_simple_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/sobre_o_behaviorismo_minhateca.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_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 5732 bytes
SHA-256: bc46cbc817465761c3e06b1a24497e6161a1cf1983bd77ee299868b15ef2e0b8
font_01_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 11240 bytes
SHA-256: fb3d3620224d6bc2748628a33fdcfc16b5bb48ebfae6a2e4d510eed31b1a84bb

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