Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ab49b936c6bcfc…

MALICIOUS

PDF

63.0 KB Created: 2021-01-09 12:00:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8bfcca67ae468d4cbe320dd3e1f5f6ee SHA-1: f6755883dba5c5df0150d4caa12ed4184af89407 SHA-256: b9ab49b936c6bcfc18fae9c59fbe66470ad33909738377da56df075d37a32cf2
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam, where the document likely prompts the user to call a phone number. While no scripts were extracted, the presence of an external URI suggests potential payload delivery or C2 communication.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafficel.ru/wb?keyword=zig%20zag%20wraps%20grape PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426695/normal_5f9eab0fc5e52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380523/normal_5fd171be1f14c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428045/normal_5fec01ce8f375.pdfIn PDF document text
    • https://cdn.sqhk.co/wavagowew/iThdhf4/84878661816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f8af67f72b31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_5fbed0898c440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368504/normal_5fb66839c8939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f93e5b640af5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405467/normal_5fb889df95e1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459936/normal_5ff3bdfb480e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480591/normal_5fcf598434c3a.pdfIn PDF document text
    • https://cdn.sqhk.co/fovulifavu/Shahhzg/4k_wallpapers_auto_wallpaper_changer_pro_apk.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/ea832d83-5cb7-4846-ba3b-d11b67e56cb1/software_data_cable_dami_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4760afc-a4d0-4568-b3cf-57536d4fad66/dileviso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/582361e4-e6ac-45c4-b7c4-30590f24a2f5/18729477742.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_off0000b873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB873 5052 bytes
SHA-256: 53fed6d9ee5654e86a08133a096391666302fe268423a5bb00d46494865ae38b
font_01_sfnt_off0000c9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D0 11048 bytes
SHA-256: 665ecbcdd4af101a64d3b2ecbe8030afcb3fea374c6e857de93aaa1853d72d82

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