Malicious PDF — malware analysis report

Static analysis result for SHA-256 0256fb210ece2353…

MALICIOUS

PDF

94.6 KB Created: 2021-05-04 00:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0496bca54bc8eec6b3d9f0399b1af26d SHA-1: b465fe7e828cddd566d56e07e9acd21a91f9e03b SHA-256: 0256fb210ece2353d5265ca2f5536e9204f7f3165528c0b5bc6adac702951466
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous external links, one of which is a redirector for driver downloads. The presence of a link farm and the use of a redirector suggest an attempt to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=hp+probook+650+audio+driver+download PDF link annotation
    • https://gumopokexu.weebly.com/uploads/1/3/0/8/130814161/lazowejilepanejala.pdfIn PDF document text
    • http://foxiduwanati.mygamesonline.org/buduwusenedoxomux.pdfIn PDF document text
    • https://jofexudu.weebly.com/uploads/1/3/5/2/135295173/rusagonirubudadalu.pdfIn PDF document text
    • https://doliwejivus.weebly.com/uploads/1/3/4/3/134353379/ca2b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8035c368-62b5-4e0f-b07c-73fd2baf85c9.filesusr.com/ugd/2ee8d4_7cfa8e6aac5c4d7f8bfcb45f1897a96c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9cdc353-ffb9-43cc-b050-92517d64888a/how_to_make_your_own_forex_strategy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f65fc4b-67a2-41c3-9562-cfb0923a2a64/photoshop_windows_10_software_free_download.pdfIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_b8de872e87da4631ab1503d40377fbce.pdf?index=trueIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_32a67f3c04d8463bb719257b742840bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/378d2b5d-395a-4941-ad33-dfe764f91a5b/does_starbucks_pay_every_week.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b966962-384c-4adf-ae88-c91f97b0cfd3/the_awakening_kate_chopin_book_review.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/how_to_start_information_technology_business_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d7454e-d6b3-4a0d-b657-df834f0ae004/how_to_write_a_conclusion_for_an_analytical_essay.pdfIn PDF document text
    • http://pabizex.atwebpages.com/vimisapafuliwosubitokopil.pdfIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_3a144f2b8e5f48009228552b447e7e6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6ca35ed-c128-4207-bc88-a95693960f34/wisevobeb.pdfIn PDF document text
    • http://bugazepoja.onlinewebshop.net/botany_books_free.pdfIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_faafbbd3b35c4142a2b5c7b482a36377.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5560473d-e7e3-4fbe-b555-e279c3af6f9f/craftsman_zts_7500_service_manual.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_off000132fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FA 5512 bytes
SHA-256: d6613616bcbf0f15ea7ff8ab8cc8c386c0f2e7e106cfa36941f21f5bab948a0f
font_01_sfnt_off000145d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D7 11524 bytes
SHA-256: 35199dcfcf22a8c382b60b4e977d9249f03533355fdd2a6d06bc920821ff85d2