Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6c0a12433803f5…

MALICIOUS

PDF

77.9 KB Created: 2021-04-17 21:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6845a35b659f7dafa102b241c1876f78 SHA-1: fbb4ccd83c202e6c83e0dfe1dca1c54140a93271 SHA-256: 8d6c0a12433803f50c011a28bc22f4eff249f1c36f8e90a471f5aac478666ff5
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to disposable hosting or redirector infrastructure, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs likely serve as the primary mechanism for directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=beauty+and+the+beast+violin+solo+sheet+music+free In PDF document text
    • https://xegazoniwenopuk.weebly.com/uploads/1/3/6/0/136011370/pemos.pdfIn PDF document text
    • https://koreperuk.weebly.com/uploads/1/3/2/6/132680900/6139054.pdfIn PDF document text
    • https://jinajifija.weebly.com/uploads/1/3/4/8/134889339/5143503.pdfIn PDF document text
    • http://papotupeti.iblogger.org/27508440433.pdfIn PDF document text
    • https://niwarixetawozav.weebly.com/uploads/1/3/4/1/134108921/3fce20c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_ac8bc23d5f0344658a5f0d05dba091ac.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_a3cfdf26a8c6417aa15aad7733d3a33e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e00d4197-1457-4055-a448-f43ede0b0852/kijoxafazigujeraxividezog.pdfIn PDF document text
    • http://zixakuwali.rf.gd/76939486015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8f21c5e-94ed-4998-9fe7-c27658af71f0/construction_company_balance_sheet_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba1ab300-21b4-46da-a999-097b002db752/xixewamuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25767761-ff95-419b-9aad-ad33255bdc9b/pawidubezexopef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47a3aa3b-1c17-46cd-958c-8417543939dd/jufof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6c9e4c6-b90d-4a16-b566-cd504a664624/7391335214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a516bdd-f5a3-46c7-a29f-4161a910591b/39575080563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/579e14d4-9006-4c3c-8779-f615dd402281/good_animation_apps_for_pc_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d450badb-1bcd-4636-9c00-5784b955dc18/which_is_the_most_coldest_place_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff61036a-d041-4d89-bac2-ab099942abd9/engineering_mathematics_2_syllabus_anna_university_regulation_2013.pdfIn PDF document text
    • http://fudowoxalukiki.rf.gd/sample_balance_sheet_for_small_business.pdfIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_24c7e8b6db444d65b82624746abfc6c3.pdf?index=trueIn PDF document text
    • http://sibiziditex.epizy.com/patape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d811b4af-195a-4b8b-bd5a-4c5082987b06/straight_talk_mobile_hotspot_refill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3bd83aa-0146-4459-b09a-1057c8dfcb43/38663482336.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_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 5612 bytes
SHA-256: a97581197061c85861951ae5c8027f4a4b589fabeaf9fece11e4a5c773a42d95
font_01_sfnt_off00010455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10455 11200 bytes
SHA-256: 81fd1549e81f9aa09c183ee97574093923eaf383e61539fa9c29f7a4296e33c1