Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a22698a84c0f1a9…

MALICIOUS

PDF

85.4 KB Created: 2021-06-05 02:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 495003be9dbc2381ffe3caa870c71561 SHA-1: a69c834288e9d8a90396bebe1627e778f5c86314 SHA-256: 4a22698a84c0f1a9ada423f2e79469cd509e9859f7571c913adfdbe3a13b3d08
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with one suspicious URL pointing to a potential phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pistant.ru/pbw?utm_term=do+all+air+fryers+cause+cancer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370053/normal_60312ff7f0617.pdfIn PDF document text
    • https://tedinuvade.weebly.com/uploads/1/3/4/3/134348171/8659394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411498/normal_606e5f54be8b2.pdfIn PDF document text
    • https://vuligezu.weebly.com/uploads/1/3/5/3/135391643/mozipuje.pdfIn PDF document text
    • https://boxusopusaw.weebly.com/uploads/1/3/1/3/131398197/lusikenitu.pdfIn PDF document text
    • https://xaranetudu.weebly.com/uploads/1/3/4/0/134016810/voxuni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408853/normal_602ca101532a3.pdfIn PDF document text
    • https://genaxixa.weebly.com/uploads/1/3/1/4/131437685/niteje_lakotidufuloruv_figufero.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416149/normal_5fdfc74f04365.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://uploads.strikinglycdn.com/files/347c596d-4508-4782-9f43-6dd4cbc64a27/easiest_way_to_get_rid_of_poison_ivy_rash.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b85ec3a-6809-4593-8ba1-1be3870aa8af/30060492555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e9fd13d-02df-43ac-b78e-432ebd015c41/65110212409.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/order_of_operations_with_integers_coloring_worksheet.pdfIn PDF document text
    • http://fevuxowina.pbworks.com/f/gogazubajebenuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5277c5f6-95c4-4e4f-9f46-f2cacd947b0d/how_to_replace_samsung_french_door_gasket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae1e81cd-cced-4c60-98d2-7b5feaf466c1/7038174796.pdfIn PDF document text
    • http://wefolevemud.pbworks.com/f/rakurexemixo.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/w/file/fetch/144631200/nonton_drama_cambrian_period_sub_indo.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144454203/rohs_reach_compliance_letter_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1742752b-ce5c-44ca-af22-ab793038e8d2/how_to_set_an_rca_universal_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6fed3f2-b6d0-4078-a22c-bf15b8a7da78/73625565668.pdfIn PDF document text
    • http://faxamom.pbworks.com/f/what_does_a_roof_inspection_report_look_like.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b2028e-4578-4706-b039-afa6629a0160/the_complete_tales_of_winnie_the_pooh_free.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/w/file/fetch/144459444/mapa_metro_lisboa_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f986cd4d-c803-4d0d-b136-ba5844b3d765/3413711918.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_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 4776 bytes
SHA-256: 4d79a9d2bdad9b91710e32249dda1682bad322da9c32da61d88801ad62d045fb
font_01_sfnt_off00011510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11510 10752 bytes
SHA-256: c8d43c7f902acd9fb77a377071feeeec1ab1b8d32b9f2441477e279fcf4787d4
font_02_sfnt_off000139b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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