Malicious PDF — malware analysis report

Static analysis result for SHA-256 817b2b704ef8cb09…

MALICIOUS

PDF

74.6 KB Created: 2021-05-24 23:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d3a81eacbe10768ddc7305a293b02f56 SHA-1: d64d752dcee7e504e533bf0aa5977aa584691e39 SHA-256: 817b2b704ef8cb09c23f03a211c83c43c184068fe983416793052ab06c11c754
136 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URL that acts as an SEO redirector, likely luring users with the promise of 'Pirates of the Caribbean' sheet music. The primary IOC is the redirector URL, which is designed to lead users to a malicious payload. No scripts were extracted, but the PDF structure and embedded URL suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=pirates+of+the+caribbean+theme+song+piano+sheet+easy PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496165/normal_6008483848ece.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_6044fd872f2e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466662/normal_5fea3982ad060.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451737/normal_602da7f64911d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404105/normal_60446ca5c8fd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409797/normal_604de7398cc72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390385/normal_6044680ac1de6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445558/normal_5feccacf3174f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426676/normal_604ebc94e2b4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391602/normal_6027220825226.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kisimujuk/arm_cortex-_a53_quad_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6942670-cdd4-4218-8167-f472a0c678d1/duxunusezupadodilowit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d05c818-73b6-4624-a54c-873e2e099d2f/rejupasonaz.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/graphisoft_archicad_22_studentenversion.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/variable_inlet_guide_vanes_gas_turbine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4e3d8ff-0341-4942-8b09-9ae740606b5d/wometufiropaxudipogap.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/bauhaus_design.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/2444267705.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/in_the_spirit_of_laws_montesquieu_proposed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1543a3-fe61-4f30-b480-c166baf02c60/toyota_camry_for_sale_in_gauteng.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/calculus_larson_11th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/vojikijibofupapubege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd07c775-3746-44a6-8907-0ecfc46ed82a/labosoramedugaluzoxume.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_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 5428 bytes
SHA-256: 955575a679a8b29ccc4998c8ff958fcb79ddbbad3ddf0e6c1263f70d1e9890cd
font_01_sfnt_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 10572 bytes
SHA-256: bad4799dcf5ec56c87eae16a19d2dee602f683d2d4900c52b6c153c74f8f5ab4
font_02_sfnt_off00010c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C18 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e