Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3965dd90776395e…

MALICIOUS

PDF

83.5 KB Created: 2021-03-31 20:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 05036f4674253026b319373ebeb673f7 SHA-1: 27adb325f57cfc0354bd0ad80a177ef02c5023f7 SHA-256: b3965dd90776395ecbc49d22cd627ca33d85e0d8aaea8df2d80d9acdc4327749
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains and file hosting services, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to drive traffic to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=drill+and+tap+chart+standard+pdf PDF link annotation
    • https://cdn.sqhk.co/kewusikata/QAOibgi/lokezusopufujovube.pdfIn PDF document text
    • https://bimuxafidiw.weebly.com/uploads/1/3/4/7/134701061/morukisaseda-voloxamepusa.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/jhawG1p/xuluruvokafojezeladivefe.pdfIn PDF document text
    • https://cdn.sqhk.co/rowazazapa/jjbd8a7/xogiwazubax.pdfIn PDF document text
    • http://magnetfix.store/balcony_scene_romeo_and_juliet_sheet_music997eb.pdfIn PDF document text
    • https://wuvonavozaf.weebly.com/uploads/1/3/2/6/132695620/kufejironividej.pdfIn PDF document text
    • http://lessonsonline.site/kafazulazoris16q3t.pdfIn PDF document text
    • https://cdn.sqhk.co/rezejigobip/uidjhgf/audio_jain_bhajan_free.pdfIn PDF document text
    • http://verification-help.business/mufaxakanusmjid.pdfIn PDF document text
    • https://mepubigavij.weebly.com/uploads/1/3/4/5/134599646/nurilufagesexawumel.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/TFlhiNr/guideline_af_aha.pdfIn PDF document text
    • https://cdn.sqhk.co/nububufi/gdBw35w/32868618040.pdfIn PDF document text
    • http://pay-order.info/adobe_kuler_free5lug6.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/gJ3jbgh/xobesosubepex.pdfIn PDF document text
    • http://matcobzor.ru/best_research_paper_topics_2020257ox.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/FgfieTS/voluwivorebojame.pdfIn PDF document text
    • https://cdn.sqhk.co/manoxixo/ehdQXUi/77580581844.pdfIn PDF document text
    • https://xaminipa.weebly.com/uploads/1/3/1/0/131071220/2866272.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_dc9d689fafa04ece8bf46c382ce56ff6.pdf?index=trueIn PDF document text
    • https://562a32fb-e9c8-4d8f-ac7e-a760da58c396.filesusr.com/ugd/68ec97_c6776441e8bd446583ead2b873f06528.pdf?index=trueIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_a1ddba8b923d4d21a5e85d5e5786d849.pdf?index=trueIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_79c575bad9d6443eb21e070c3d95adf4.pdf?index=trueIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_67619f10fed349dda2c420b9c43b2afb.pdf?index=trueIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_24b1276a91f94a7b9981e43af2496f4e.pdf?index=trueIn PDF document text
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_76e5d3fe94334d74aebeed7f583ceddd.pdf?index=trueIn PDF document text
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_a86949c489ac413490a3d00f0f185e65.pdf?index=trueIn 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_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 5240 bytes
SHA-256: 5dd133540e97c13cb9c4e167c4d2956dd60262e4a0f417f0c955f831197a7e5a
font_01_sfnt_off00011841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11841 11708 bytes
SHA-256: 79e93bf41939eb948dbfdf3f7e79d8875ff4cce463dece5c890cf460133ea471