Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d6adf8690a744c…

MALICIOUS

PDF

97.0 KB Created: 2021-03-25 15:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eb3d3c4dae1fad559cb9db307492b990 SHA-1: 9890ddb5ebc724041fec1c5cc6282c01f93363ae SHA-256: b4d6adf8690a744c2933fd733d7befc101c3d85e32a5013124893c091c7e6bef
244 Risk Score

Malware Insights

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

This PDF file contains a link farm designed to redirect users to potentially malicious content, masquerading as a download for a book. The primary URL, 'https://yafferge.ru/wix?keyword=unspoken+feelings+of+a+gentleman+pdf+download', is flagged as a malicious redirector. The presence of numerous links to other PDF files, many hosted on disposable domains, indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://yafferge.ru/wix?keyword=unspoken+feelings+of+a+gentleman+pdf+download In PDF document text
    • http://xuxuxib.iblogger.org/35910443791.pdfIn PDF document text
    • https://cdn.sqhk.co/jebuxanit/jgi3hbR/large_numbers_esl_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/iWjg2ha/31090498031.pdfIn PDF document text
    • https://cdn.sqhk.co/kowukogifaw/ciamqBX/chrome_video_blob.pdfIn PDF document text
    • http://dubiniba.iblogger.org/emulateur_android_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/14463168651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/240533c9-667c-46d9-bc7b-80a0ed42c041/is_louana_coconut_oil_refined.pdfIn PDF document text
    • http://koxaxoboxuzir.epizy.com/the_adventures_of_huckleberry_finn_mark_twain_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca4faaf-e6c1-497a-ac4b-9683ba410c4c/32064063897.pdfIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_0e48f5d6aa5544849b1a5770035744bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ec6227-8217-4495-a5d8-e7bc0e15a868/how_to_access_onenote_on_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/9338797776.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_883b83c1ed5f4505828cae0fbd2ea059.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kufazete/27179635053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c26379e-5c30-4f1d-ac1b-3ce20a40d882/fanuc_plc_programming_software.pdfIn PDF document text
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_c018f7c30aa642da9a7dd58dcadea4bb.pdf?index=trueIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_b17fba9a5d644998b74210e8643ac448.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a870a767-c78c-4bef-bebf-21674fbc2584/lufigunukavamu.pdfIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_4be3e8fc896646a69827dfa7ce635e10.pdf?index=trueIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_90e25ed8e17c4303903bc822f07de22c.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_4aa773915b0648418dca2374c6216661.pdf?index=trueIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_f25e2170d57044c5958f54987a8faac2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/casanova_hotel_apkpure.pdfIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_c9ee0566d5cb43edb8cc7d2735b48b64.pdf?index=trueIn 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_off00013a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A91 5412 bytes
SHA-256: 48d81e50458e0743792134cad7f6765cb53bdd6eb600438da1197b395dc0f91a
font_01_sfnt_off00014d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D06 12584 bytes
SHA-256: f9f64d4f8f7fa3b32a087e1abccff98d970dd0269d58be1b0f46e916841ec182