Malicious PDF — malware analysis report

Static analysis result for SHA-256 31807226f7a2eb31…

MALICIOUS

PDF

104.7 KB Created: 2021-03-16 13:00:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 14f41d6f79bdaf4daf0a2d3c13de239a SHA-1: 5faa7a2b6bfee565b5843aef4f4e114f0504040b SHA-256: 31807226f7a2eb31ed5de7483f3785431efd2fdead027f7145f38a10d4d8126b
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, indicative of a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://maypoin.ru/award?keyword=alternity+gamemaster+guide+pdf+download PDF link annotation
    • http://duzegotola.medianewsonline.com/42101730675.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/autocad_2016_tutorial.pdfIn PDF document text
    • https://bewimesev.weebly.com/uploads/1/3/4/7/134753962/4493066.pdfIn PDF document text
    • https://nedamekiwuj.weebly.com/uploads/1/3/1/3/131379605/rivifepofobe_sajaxixap.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/67474485981.pdfIn PDF document text
    • http://juborad.mywebcommunity.org/33479476420.pdfIn PDF document text
    • https://sigojexubaj.weebly.com/uploads/1/3/2/6/132682800/mefugilabibale.pdfIn PDF document text
    • https://raxagipob.weebly.com/uploads/1/3/4/8/134883443/7325696.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/after_we_fell_movie_uk_release_date.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8a83ad47-1dc6-4e38-b726-138de0fe4a7e.filesusr.com/ugd/043c68_803d2b792eaa4a659d96a5d5c66c0338.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_4535fb5bd5224637b5978820012898cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77348168-eb2e-4c8e-99cf-22fed6a276b1/open_questions_for_the_three-part_lesson.pdfIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_5c3924ab1b0c4b9bb448b1088d0c1566.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4764b8-84ee-408f-bed8-186f6400340e/brother_mfc-j615w_ink_refill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94dbbe52-5693-4aa7-ae3f-a869310c85fa/lankavatara_sutra_sinhala_book.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_9f263537d5234523b4d19e66c8b15042.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_3f2481cc805e4cb3b9ffac4e114e5422.pdf?index=trueIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_e3d3f6e57d6043be98f02eab32b49173.pdf?index=trueIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_3e40814916f24a8f8b26006cd5412d30.pdf?index=trueIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_04e64ebdf47a461f8bc5765e0f2e8ee0.pdf?index=trueIn PDF document text
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_48b62e533a394149a98c9336b101b0c9.pdf?index=trueIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_b03f7c74ac4846c8b73371396704c13b.pdf?index=trueIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_70dea242c5f9404d86573d80d1f26547.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_63cb0be9ef4d4860a711b47121c93f7e.pdf?index=trueIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_a732d61ad04543bd81d60f22f1c7f72a.pdf?index=trueIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_e8a617484b874674b4cd29a2e1807a77.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa27e74-ff8f-4b45-a983-97a85e11194a/fumajexap.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_off00015be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE3 5544 bytes
SHA-256: 514e5500356de9a77ef20a327f5e627323765add0285495e0af68e5b221eb513
font_01_sfnt_off00016ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ECF 11216 bytes
SHA-256: 8e66f06177c22ab4abe400446064a5635cd0c713674aa77316217ad1ecaccf16

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