Malicious PDF — malware analysis report

Static analysis result for SHA-256 880233c7499b050c…

MALICIOUS

PDF

79.5 KB Created: 2020-11-23 06:30:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ff3ed7924b9731f748717843fd6af411 SHA-1: bb0ccd9bd416029527775c0b53428da4f70e719e SHA-256: 880233c7499b050cf85e3daa0ba4c71283d0ffbe1d9e94382769d2065243352f
154 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier. A critical heuristic indicates the PDF contains a link to known malicious redirector infrastructure, specifically `https://traffking.ru/aws?utm_term=business+basics+teacher%2527+s+book+pdf`. This suggests the primary purpose is to lure the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/aws?utm_term=business+basics+teacher%2527+s+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4483097/normal_5fb5290aede2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494431/normal_5fabca83efc9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488346/normal_5faea7d0664eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_5fa9fd6754273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_5fbb26e2151b7.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/6021c7b7-0053-46d9-a719-a0256d2e6daf/dogexiwowegodebugev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b76f90-8703-4ca8-9c19-1b54b6be5940/the_elements_in_group_7_of_the_periodic_table.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/dagidasuwibulin.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/90698502654.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/customer_care_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25eb84fc-07cd-4af1-8833-10f01831dcf1/villages_photography_club.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/94463141936.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_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 5496 bytes
SHA-256: 749021e56ac11fc04d26e66b92447deb68a3cea0b7711a270fa844c7cb939e39
font_01_sfnt_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 21192 bytes
SHA-256: 31dd098a6c6a40f4c7c8efbc7eebe278e1be9978ea3b11a96ced3223e508838d

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