Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7a3ec4c780430b…

MALICIOUS

PDF

79.4 KB Created: 2021-03-19 15:56:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ff73831ca107830e3f8e396f28d2a51b SHA-1: 21fbed818c68bd1b30432aea1d7ea2cd2ace9a28 SHA-256: 8a7a3ec4c780430b01edb47f0bd22f5a8cf72d2333a49d43d546bb3c9568121f
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/123?utm_term=formation+pour+devenir+agent+general+d%2527+assurance PDF link annotation
    • https://cdn.sqhk.co/vinizedanuve/gegcggg/learn_kung_fu_online_for_free.pdfIn PDF document text
    • http://poopo.ru/julakemapegavered0cx1.pdfIn PDF document text
    • http://xevidome.iblogger.org/sheet_nhc_river_flows_in_you.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416791/normal_602224bec5850.pdfIn PDF document text
    • http://reduslim-shopofficial.site/33777236062f00yz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_60280f1f88f7c.pdfIn PDF document text
    • http://jotusimemirido.sportsontheweb.net/what_is_foil_in_literature.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/eU0Mqgg/bounce_house_water_slide_near_me.pdfIn PDF document text
    • http://serarudipiwuvon.mypressonline.com/death_of_a_salesman_short_summary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5fdbd0ec1c12c.pdfIn PDF document text
    • http://trujillostacoshop.com/toyota_techstream_crack_download1rjoz.pdfIn PDF document text
    • http://tamigome.scienceontheweb.net/bajaj_logo.pdfIn PDF document text
    • http://olymptrade.buzz/greenlee_dm-20_troubleshootingu0zor.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/Ihhgehh/72568978651.pdfIn PDF document text
    • http://cozyplacefor.rest/arthdal_chronicles_ep_18_eng_subd814f.pdfIn PDF document text
    • https://cdn.sqhk.co/ketegobuto/ihibqLx/amazing_grace_violin_solo.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/jggcdAh/98324783652.pdfIn PDF document text
    • http://jofigapowewumaw.22web.org/85085641808.pdfIn PDF document text
    • http://viwavidif.getenjoyment.net/codigo_de_etica_de_trabajo_social_chile.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwedilejom.myartsonline.com/beckett_baseball_price_guide_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac944f55-5898-4b9d-9180-72c782c7d1fa/wheres_my_license_mn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bad3453-9fcc-4b8f-a767-9a79625674e7/texefuvivozigixoxewerun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bed74e3f-2132-4b91-9baa-041082bc043f/mlk_letter_from_birmingham_jail_summary_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a865d7-3ae6-4490-b275-f745cceee15e/47020695885.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_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 5440 bytes
SHA-256: 738b09bb97c983585d730458f1c2606d9145f5ec3644f61e1cf0a42b68e21635
font_01_sfnt_off000104e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 12900 bytes
SHA-256: d80a0f0375625e0c0897d961b383843948e1ae28083795f3eec334c89f364c82