Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ff0ca0db19a5dc…

MALICIOUS

PDF

71.5 KB Created: 2020-11-30 17:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 531665b0097bff8bec27e9fe92cc2b4d SHA-1: e60c1d95f13ba754d2301cbeb4ff0ef136ac49f6 SHA-256: f4ff0ca0db19a5dc8682ce2c226bc270a6a53388623c013e8df8390da08c3c83
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://trafffe.ru/123?utm_term=using+a+thesaurus+worksheet', which is likely part of a phishing or scam campaign. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', further indicating malicious intent. No scripts were extracted, but the structure suggests a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=using+a+thesaurus+worksheet PDF link annotation
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/8948163.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://s3.amazonaws.com/tenunud/kefoxikubopumaxotijef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91dc1952-607c-4f6e-9c72-c47201dde3a4/57828127037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7675d799-5483-4f71-8339-114f572cca9a/ps_touch_apkpure.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc18edba8793968640cfc97/t/5fc4768708845d092418ee95/1606710920311/daturokumotabo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4d472dd96f5918e4fcef/1606372679598/air_mass_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/37902032584.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf509cbc819f1cf4cf1faf/1606373533133/xafaberoxinuwodon.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffbf92e34347c703edab4/t/5fc2a8a3173fb5383bfa4ce3/1606592677202/table_saw_featherboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b16591-3eae-47cf-96af-a560773852e6/88405870945.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf62d59b1ed03538d2fd2c/1606378197789/vivitivogewaponoxirij.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf62d68bfc51861673f79/1606219309709/77364758929.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c3d560f2895dc1e72903/t/5fc111d6f3de5e49b58a441b/1606488534943/sekojigosogemiw.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_off0000cc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0E 4944 bytes
SHA-256: e801af4f7176a64b412e42462b2f3e003f86fd67253d69a2bb083ea1499c2bfb
font_01_sfnt_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 11272 bytes
SHA-256: 42a9477833fafabac8bf5de3f5bb8b2677f79bc400c256bc46cf2b827bf69ed9
font_02_sfnt_off00010339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10339 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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