Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf4b71cae8d9997…

MALICIOUS

PDF

73.9 KB Created: 2020-12-15 19:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d85d18714e05c4096b12d739cc9ea782 SHA-1: d176d96787f6a970f30ecfacd46b3fc6fde6db39 SHA-256: aaf4b71cae8d9997b844fea50f78916000974edc57dcee9002f3b0342cf4b701
154 Risk Score

Malware Insights

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

The file is a PDF containing a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic and ClamAV detection. The ML classifier also strongly flagged this PDF as malicious. The embedded URL likely serves as a lure to a phishing site or a download server for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://gettraff.ru/aws?utm_term=where+is+bituminous+coal+formed In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_5f919ed6278fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_5f9cf99777325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_5f9fce12c68b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459483/normal_5fb8b92be475c.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://static1.squarespace.com/static/5fc0f88bd26ff1194f740ef3/t/5fc19214a97599144e32fe40/1606521364995/vixanabokenudu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce3073190b057dd37eca90/t/5fd6dd38c4373837b91d8c60/1607916857681/capleton_warn_dem.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/wevixebojidenuboj.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/professional_cv_template_for_developer.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/search_everything_for_pc.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5d1c924b06a7eb32152dd/t/5fcadd97b6b7366152eccfa7/1607130522245/16845817847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf7c8a7-1ebd-4d17-95f7-9921a0c29c10/a_new_economic_view_of_american_hist.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/six_lined_racerunner_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50652f89-883a-4127-aa4f-a46b51670ddc/vizio_sb3851-c0_remote.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d135bf71053ccb0fc630/t/5fc2979c173fb5383bf7a080/1606588317250/radical_self_acceptance_tara_brach.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_off0000d6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B9 5296 bytes
SHA-256: d8e36e49ef796fcdef8529f816856d0beb4429fdfd92c6a441b132219f22e503
font_01_sfnt_off0000e894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 10592 bytes
SHA-256: 086f62237144b2c7bbc2497f4b4f9356f287ff77feb5074dd0b7ddc7bc9af9b2
font_02_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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