Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd236b13ddc0ea64…

MALICIOUS

PDF

78.9 KB Created: 2021-03-12 07:22:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a13b2845a5efdc3d4eeda35a3d3a8a3e SHA-1: 8c06edbe71fd6f6327c5726e5f99bc958da6b72d SHA-256: dd236b13ddc0ea64050842bdb20111c423849dbd511cbc0d1f227c9f55366d90
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links pointing to external PDF files, many hosted on disposable domains or redirector infrastructure. Heuristics indicate this is a link farm, likely intended for SEO manipulation or to distribute further malicious content. ClamAV detection and ML classification confirm its malicious nature, suggesting it's a phishing or trojan distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/award?keyword=vo2+max+treadmill+test+pdf In PDF document text
    • https://sudefenumub.weebly.com/uploads/1/3/5/9/135984534/35d518c5a.pdfIn PDF document text
    • https://lugijuvumefabi.weebly.com/uploads/1/3/4/7/134761930/wibadiduxelopul-mumomorutipumox.pdfIn PDF document text
    • https://koxewujinam.weebly.com/uploads/1/3/3/9/133986689/942e3b3af81dc32.pdfIn PDF document text
    • https://wazafalesozem.weebly.com/uploads/1/3/4/4/134498636/1712050.pdfIn PDF document text
    • https://nogikukejigili.weebly.com/uploads/1/3/0/8/130873965/tomarademaxib_lumivu.pdfIn PDF document text
    • https://kupifibadobibe.weebly.com/uploads/1/3/4/5/134512214/futitejofixawebik.pdfIn PDF document text
    • https://tijirurilulade.weebly.com/uploads/1/3/4/3/134312421/7587611.pdfIn PDF document text
    • https://tuwoganerolet.weebly.com/uploads/1/3/4/6/134631505/senugiminavab.pdfIn PDF document text
    • https://foxuginatumusex.weebly.com/uploads/1/3/0/7/130775376/6607558.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/d85d8012-c6ee-482b-8456-1540ce8ae587/celestron_astromaster_114_eq_reflector_telescope_review.pdfIn PDF document text
    • http://lefivagalowo.rf.gd/dobuzipekaxuveza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6403a84-cbe7-495a-83ea-53e0e5cda0b8/71595271460.pdfIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_aae65511a4dd4d6fb22a98d0b884ed59.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_2f2b8c2f4683476aa2871c59d2ced763.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_9dadcd19eb67431c9db62e31cb1f3919.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b864958-0fcd-4e88-80a1-a1de8c9c4b8e/how_to_become_a_vet_assistant_in_ny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb6a942-2e81-48ce-93fa-e5458d230344/lord_i_need_u_by_chris_tomlin_download.pdfIn PDF document text
    • http://vepilezora.epizy.com/facebook_page_banner_template_2018.pdfIn PDF document text
    • http://zovameden.rf.gd/converting_metric_measures_worksheet_ks2.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_29ca116b2c14449ebd91568331de6be2.pdf?index=trueIn PDF document text
    • http://bejegexojadivaj.epizy.com/placement_report_iit_bombay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cadf564c-ceb5-4221-8c94-8fab5638ccd7/40390123312.pdfIn PDF document text
    • http://jemejuzot.epizy.com/mazafasinenugomonukim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ef413d-a1ae-40a0-94f1-f73fbd48fdb7/nawelimolux.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 5352 bytes
SHA-256: 01719d2d575c36d6fd47df6d7f8b674d8c944926b16ca4a604f71442584b6189
font_01_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 3644 bytes
SHA-256: 983e6e009f310dfdf9159148c33360d772fb52502ba0a4c39ef599c3b723bf0b
font_02_sfnt_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 10276 bytes
SHA-256: d4ecad2e8bdc8ad6ac46eb38fb4c7ecd607ab044ca26bca48e2fb3a480ec58a5

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