Malicious PDF — malware analysis report

Static analysis result for SHA-256 5224a0a5f6afdf3a…

MALICIOUS

PDF

76.4 KB Created: 2021-05-28 00:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 596bb439bf19736cf6aa98163b2d3519 SHA-1: d51e051f36cf901d347e69d83253c9df9ce2c43e SHA-256: 5224a0a5f6afdf3a89604aa957ae8b195a8ae842bf82ce3602ed56dbd2e7c707
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external URLs, including one pointing to 'fokemale.ru', suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, appears to be a lure related to salary increases, likely intended to trick users into clicking malicious links.

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
  • 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://fokemale.ru/123?utm_term=salary+increase+letter+template+for+employee PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415934/normal_6016216c2988e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497369/normal_5ff2f9926e69a.pdfIn PDF document text
    • https://sabexinutix.weebly.com/uploads/1/3/0/7/130740027/xofizevijikom-mobidovowigavox.pdfIn PDF document text
    • https://kupezomevul.weebly.com/uploads/1/3/1/1/131164546/95926ca669b446b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476123/normal_5fca3f60d9c03.pdfIn PDF document text
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/4081201.pdfIn PDF document text
    • https://doxemikawapuki.weebly.com/uploads/1/3/4/3/134314999/jovositegetez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416149/normal_602d567300d74.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450340/normal_60b00e4ba2608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383340/normal_602208434705e.pdfIn PDF document text
    • https://fefufivakelazi.weebly.com/uploads/1/3/0/7/130739222/5a7fb75e33f8.pdfIn PDF document text
    • https://duwesokele.weebly.com/uploads/1/3/1/6/131606866/sexokaxosirog-gufamawun-mozowanawegi.pdfIn PDF document text
    • https://molefagis.weebly.com/uploads/1/3/5/3/135311004/wagagureposirepem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470826/normal_6029243bd0df8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_5fd8309adda87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418981/normal_6061a7a89bd15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390641/normal_5ff709a9e4873.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b6f1c40-0a97-447c-8f01-354f24fd0d5f/79081212751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ab4737-14ac-46c8-bc1f-fdf7710a5931/how_much_do_internal_auditors_get_paid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da507b59-6544-464d-9dfd-447adf0b4f49/vitowekilefaxekon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/667b9663-ef36-47cb-bd1a-aeb432b0dfa0/goxir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b26e2a87-a858-4314-b408-6ac57e4c71e8/what_is_the_maintenance_schedule_for_a_harley_davidson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b55da8-fd5a-4df4-922a-2827f34f71d5/ejercicios_analisis_morfologico_y_sintactico_5_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d11f3c99-e197-4920-9ba7-d91d4d390476/que_se_puede_comer_cuando_se_tiene_reflujo_gastrico.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_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 5364 bytes
SHA-256: af1386d6a7e3d733dc682e6261e572dcf84bfe0b83f5302d5cd0e1f0d49d8fd6
font_01_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 10148 bytes
SHA-256: 9f594ccccf5ac99930df65fe1a2886fb98171230e5968f5e8d4d7b251c680e0b

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