Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8de04fa52a44bd4…

MALICIOUS

PDF

98.1 KB Created: 2021-03-22 14:01:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8a64c62a397220ab15a1ce6fc9915a0 SHA-1: e4b0f465f3a592e59935158443260a16b0bb02e8 SHA-256: e8de04fa52a44bd4d6aa26f2bd6a3043a0d67e56f09a63b6663fbb778217562c
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=howden+fan+engineering+handbook+pdf
    • http://heliusdesign.ru/hill_manufacturing_sds_sheetsr9f7k.pdf
    • http://noxogejukebe.mypressonline.com/cuidado_holistico_en_enfermeria.pdf
    • http://viteroludobano.mypressonline.com/51972537221.pdf
    • http://domastmsk.space/xeruvovizezignm4q5.pdf
    • http://magazinrf.xyz/untimely_meditations_quotesq4i22.pdf
    • http://sale-siberian-force.online/55785930681splo6.pdf
    • https://cdn-cms.f-static.net/uploads/4490371/normal_6009e6aea9758.pdf
    • http://prognoz-football.club/48260811389h43sc.pdf
    • http://parovosi.mygamesonline.org/hoover_steam_cleaner_replacement_pads.pdf
    • https://static.s123-cdn-static.com/uploads/4425507/normal_6007cdaec90e6.pdf
    • https://cdn-cms.f-static.net/uploads/4446942/normal_6040d9cbe7d22.pdf
    • http://lnstagaram-verifiedbadges-from.com/seriwimepolazoup5wl.pdf
    • https://static.s123-cdn-static.com/uploads/4495251/normal_600282c716df5.pdf
    • https://cdn-cms.f-static.net/uploads/4387037/normal_601e26bf8c63c.pdf
    • http://zaparipajomigi.scienceontheweb.net/31240598653.pdf
    • http://sevezor.scienceontheweb.net/form_ssa-1099_non-taxable_payments.pdf
    • http://getsol.xyz/top_books_to_read_to_become_successfulwe79u.pdf
    • http://cz-nitrof.website/business_ethics_and_social_responsibility_grade_12frcrx.pdf
    • http://com-signto5.xyz/gavulolimqmadk.pdf
    • http://sakivometo.medianewsonline.com/definite_articles_exercises.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_9695548026494be29f083524405a57b3.pdf?index=true
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_1ee1144786aa40b2867fa53c926f3cc1.pdf?index=true
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_5565a399bc4d477082306381b637b431.pdf?index=true
    • http://bujijawuta.atwebpages.com/45622311855.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f4f.bin
7530480b3441c5fb690d6901f97f035e364d1ec9b9d36cd33b82088a09f21a24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4F 5352 bytes
font_01_sfnt_off0001518e.bin
8cfef73c63fc888dfec29c5dc8af633f323ddb240e29139d56a365be89059181		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1518E 13248 bytes

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