Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcf993740bc43f3…

MALICIOUS

PDF

60.8 KB Created: 2020-11-19 04:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6921d8d52a3320467b97506d223b276d SHA-1: 7a5a88998207325c1fb2a03626e9e9caf98dc4ca SHA-256: 5bcf993740bc43f3d752a95dcbdd9e402a05830f59f77028b2c0799a5fa16f43
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/123?utm_term=direct+and+indirect+quotation+worksheet'. This URL is also listed as an embedded URL. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to a 'worksheet', suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=direct+and+indirect+quotation+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415745/normal_5fa1eac472968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469841/normal_5fa72e475b4f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425772/normal_5fa4f3c6eb00b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_5fa415b3c565a.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/f5c71fb8-53b4-448c-9384-59427c284a34/glencoe_geometry_chapter_3_test_form_1_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46acbe1-7356-44e7-b27b-72e7f6c2de59/jamijepinaxibasepupasufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4abf59c-dee5-4dc3-9625-25e29ff986ba/que_es_macromedia_dreamweaver_y_para.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b304da86-4445-4997-81d8-e16c7cf88cef/lefivutakawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada4621d-91ce-4f86-b53d-4ba35ae94800/86816358186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa064f06-dec6-4324-bb75-0501236b570e/51644196834.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/27_amendments_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/gedugejefajeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73b218ff-9293-445a-9ec7-360dd132808f/80577824307.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_off0000b1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BF 5276 bytes
SHA-256: 10e1d74acfbf1d6637b19ca5987061f4ab78e49ed542c9546bd1849f37bb7d1e
font_01_sfnt_off0000c3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C1 10164 bytes
SHA-256: ec1f4865c93492ebbb00d925d49c0a84679760c0faca2f9c8e56fb3e1f20b3d4

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