Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ebd939d6e778a1…

MALICIOUS

PDF

78.5 KB Created: 2021-03-14 10:55:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fba01156fb08437240a529b16845f590 SHA-1: ca8c2fa276fc0a61657bd471a338b064e5b2c572 SHA-256: 84ebd939d6e778a13b5c9f95cf2d495eba4bafd17c0d3ce02806397db18aa4a6
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting, indicative of a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=action+words+that+start+with+b PDF link annotation
    • http://savineme.mywebcommunity.org/12652537629.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wenares.myartsonline.com/winogirubufupazakabi.pdfIn PDF document text
    • http://zeteximezoxa.myartsonline.com/wikuvoxusitabovuzisas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcebd596-83d5-4e8c-9bda-fc16f6ab026c/resmed_s9_cpap_user_manual.pdfIn PDF document text
    • https://e72deea9-3c4d-48de-8429-d2e8e2d5d9b3.filesusr.com/ugd/68b2df_243cca75939e4fbf89b72421751943ae.pdf?index=trueIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_5471feb226004ad9bdabe992b795fc61.pdf?index=trueIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_d9b2a29e603e4dcd94ae28cf2394d8cc.pdf?index=trueIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_ac3d6ba0f87142db99b47c9241315bdf.pdf?index=trueIn PDF document text
    • https://39dd5e1d-a581-41ec-a80f-9e19245c660f.filesusr.com/ugd/c2656d_15708cf7378a4baab43960fa69a48c9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5b9099-b63a-4217-a75c-b8a806f90062/sweat_app_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20adc11c-af6f-4556-8e1e-9dfd44a58205/singing_for_dummies_cd_mp3_player.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/72200235154.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/11578871899.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_39d4eeca965c4278aca5d86b0584c8a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f6176c-e648-4223-89c5-b220c09bfa43/the_righteous_mind_jonathan_haidt_goodreads.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/97560740826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/843c18c8-2301-404c-b6df-6617f5f78c9c/is_delonghi_a_good_brand_for_heaters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b6aef0-8dc0-444e-b759-864def7c1e88/dell_latitude_e6410_i5-520m_review.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/63482497659.pdfIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_c7ffd435336b43dfaa021462dcb65040.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d54b8ed-2d15-4064-9730-35a5b345815c/titafabaduxetanixiwo.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_off0000f756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 5216 bytes
SHA-256: e6b6daf1da4643c2321ebfd4ae6d076745f90885d1c718c2f032d2010565834d
font_01_sfnt_off0001091c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 10512 bytes
SHA-256: 73d9ce7bad0b170a0c5fcdab91d0d4552204c14c4bdceba59d7326238de4fe84