Malicious PDF — malware analysis report

Static analysis result for SHA-256 a738d434233f424d…

MALICIOUS

PDF

70.9 KB Created: 2020-12-23 07:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0b319a6c08f3a115d15f2bb6276f4f45 SHA-1: 077a712fad4cd460be3dc7078b0481c9fd355151 SHA-256: a738d434233f424d6bee69f3dc562a3b0a40dfc8ed546ca35fa9200cef0bef10
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. The embedded URL likely serves as a lure to a phishing page, disguised with a seemingly innocuous keyword.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/wb?keyword=teddi%20mellencamp%20all%20in%20lettuce%20taco PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411500/normal_5fd6d68de547a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409609/normal_5f9617d62c376.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/f6372f1a-01f4-4a81-96aa-885e6b9a8d5e/5935764797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56adc7eb-244d-4a57-a515-1f0afd724cd4/28433461861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc9fbdfd-6d80-460a-9c44-d44494f69e96/one_piece_stampede_streaming_vostfr_sortie.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/79356210623.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/fimalasexokuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ae4913e-b3f1-435f-9d0e-fdfeb1e7c132/chemistry_an_atoms-_focused_approach.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef3e0973-ba5c-43da-b836-b12f832020db/work_at_home_jobs_in_dallas_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df22cdc7-94f9-465f-acff-a3a6e3d09d09/86507556121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3daf5ce7-f416-439b-8ab5-e4f01d423ad9/sonic_drink_sizes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb88fbc2-7aa3-4a17-8ddc-b3e92a040d4c/icnd1_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d83ef213-9b99-4c0e-b8ac-463a5ea4c4be/kutaluxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cfcd7e2-6c8a-490a-8b88-7905844c6f57/tajuzazemato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc88a8f-e553-44bf-8133-2509b4f95b05/mebawumijetexewogikidufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf3ba5d7-9026-4df7-a3f7-aa0d6ae715a8/legipikasewilenopezot.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_off0000d6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FC 4896 bytes
SHA-256: b2dc9a899725f20f35335f44613543fb4e3208d600c013229854096aadbfb3bb
font_01_sfnt_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 11500 bytes
SHA-256: 90729456b0c3a70d4b79ff833e6b08665a46552bdc2ac743bd33eeb961766812

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