Malicious PDF — malware analysis report

Static analysis result for SHA-256 5961a7c4a7aac275…

MALICIOUS

PDF

72.0 KB Created: 2021-01-04 21:08:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b4720e247fd538229f73da08da6909ea SHA-1: 13ccc4d30c4433c04048fb8408c70f66d7b81c89 SHA-256: 5961a7c4a7aac275e81637d6d05a81b378a229b9fa020fd9aa1df6aab97977fe
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to 'https://trafficel.ru/123?utm_term=solving+quadratic+equations+worksheet+with+answers', which is likely part of a phishing lure. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site, possibly for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=solving+quadratic+equations+worksheet+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391326/normal_5fbf4f343dbe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453528/normal_5fa858a7b0737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5f96f73b49619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_5fd949dc0d57f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409798/normal_5fb9c131d3225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5fd37bab81874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423772/normal_5f9f1091d9dc7.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://uploads.strikinglycdn.com/files/d57f9069-b4da-4c3d-b35d-7341dd4f1fe1/blade_bouncer_mod_apk_revdl.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/social_media_marketing_a_practitioner_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68fc9691-f9d8-4a74-a6dd-401a141f8ba0/khloe_kardashian_fathers_day.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deaccf5f-3ce4-4bd7-a122-dcec6e9bab1b/zerudame.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_off0000cfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA3 5528 bytes
SHA-256: 5c4c8c5cb35181fbc4d3e3d0caef333c3fa7728b55998803c51239f148686dce
font_01_sfnt_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 10184 bytes
SHA-256: e764d97ed398c96e65ea1bd7d5ec2f80d4a07474ae36481a6ee0e7aacbf7f6bf
font_02_sfnt_off00010547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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