Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c72f70db7d8475d…

MALICIOUS

PDF

79.6 KB Created: 2021-04-13 01:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fd547bec040d0f874b055d26d14c5339 SHA-1: 2819960bb8e6b43df61c528a572b72625c5643b5 SHA-256: 8c72f70db7d8475d6bf2752c1051c8fe54e40636933750d4dc5c44ddf779d3e9
136 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. It contains an embedded URI and a heuristic firing indicating it's an SEO redirector for phishing. The document body, though heavily obfuscated, contains text related to 'krups toasters' and 'free-download phishing', suggesting a lure to trick users into clicking the malicious link. The primary IOC is the redirector URL which likely leads to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://botokaw.ru/strik?utm_term=where+are+krups+toasters+manufactured PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415292/normal_6052463a4d2aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_606e1c838bc99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387033/normal_5fc6ac2583631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_600e880859204.pdfIn PDF document text
    • http://winoorama.space/pipuwigevusuvor9xj3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470681/normal_5ff0ec810a310.pdfIn PDF document text
    • http://obzorov.site/boku_no_hero_quiz_quem_eu_seriafcwe2.pdfIn PDF document text
    • http://rojemop.iblogger.org/baby_groot_drawing_easy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://babedetadomil.rf.gd/apparel_merchandising_management.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/valentine_one_radar_detector.pdfIn PDF document text
    • http://waminakukivexo.rf.gd/16343995582.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/widinoregig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b4f43b4-ca45-469e-a08e-1179abae3701/18409293504.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/vugododemov.pdfIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_67dd952fa9b24693a63dcc2d8a3385ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/90372681200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a6216a3-00aa-48fa-9186-2aaa21c9518c/mayan_numbers_to_1000.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/92743415097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c71bf7ee-e0b7-4fc1-aade-7280f584155f/ronaduti.pdfIn PDF document text
    • http://juvotam.rf.gd/destination_b2_drive.pdfIn PDF document text
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_682d0b934aba4ae9b9828b56fb47a8fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc919f65-16bf-4467-9ac5-787902a0a220/pace_xg1v1_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/121eb905-3263-4f5a-8744-5cf5f4b8f0f0/nadoxe.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_off0000f905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 5440 bytes
SHA-256: 7e935a0fa687f84e056dbb3fcb9f27cc1071c239eb94defcf9fb5ff6d090a7ba
font_01_sfnt_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 10812 bytes
SHA-256: 05078f347b9de9d8b0df8a986e7c8ca34f3f8dec5536188f891992458acd9c15