Malicious PDF — malware analysis report

Static analysis result for SHA-256 007459e4b56f622d…

MALICIOUS

PDF

69.3 KB Created: 2021-02-21 03:08:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e7f9a4da191844948073ec7fcfaf2339 SHA-1: b315f0535098d8e627dfe8fd9165055b00f105a9 SHA-256: 007459e4b56f622d4575086b2aa8c9b3dacc251780fa32e19d6c3418c9f3d6e9
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a link to a known malicious redirector, yafferge.ru, which is used to serve content related to downloading an APK. The document body, though heavily obfuscated, contains references to 'Google opinion rewards apk uptodown' and the authoring application 'wkhtmltopdf', suggesting a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://yafferge.ru/wix?keyword=google+opinion+rewards+apk+uptodown In PDF document text
    • https://static.s123-cdn-static.com/uploads/4419818/normal_5fe1a5736e09e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_5fe8333595b41.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/dGQjfpZ/best_heroes_afk_arena_july_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_6018a890450c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373301/normal_5fee67684c80d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408009/normal_5fc7991e1bbb6.pdfIn PDF document text
    • http://myluckybet.xyz/912900457340dbgb.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/joHbsgd/28262882172.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/eidgdhc/78110655649.pdfIn PDF document text
    • http://freefire-gifts.com/pdf_shell_extensionh0vop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484610/normal_60171b308379c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/airhelp_assignment_form.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/xutuwevonosade.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/block_certain_websites_android.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/jamasubawelapizoxajawavub.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/android_drawable_bitmap_scaletype.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 5312 bytes
SHA-256: 0b36191909e70eba953284f04e57c4e60ca364475fa10af1d6988590f91aa381
font_01_sfnt_off0000e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 9928 bytes
SHA-256: 895c1744adc05e27030881884e983b23eb89a9b89e1ee44d9889da82a80ff19b

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