Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b15b8402f12fe3…

MALICIOUS

PDF

78.3 KB Created: 2021-03-31 18:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72f9fbd516ca5b7d26cb622ebb2e30b5 SHA-1: 9baeda90fb7253eac6f0109130dbe167ca639b84 SHA-256: 68b15b8402f12fe306588358c351c9a4e51bace1a44e46e5095ad674b2588c8d
154 Risk Score

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://yafferge.ru/strik?utm_term=legacy+of+ashes+by+tim+weiner'. This URL is the primary indicator of malicious intent, suggesting the document is designed to lure users to a compromised site. The ML classifier and ClamAV also flagged this PDF as malicious, reinforcing the assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=legacy+of+ashes+by+tim+weiner
    • https://cdn-cms.f-static.net/uploads/4417138/normal_6025a2cb3eedb.pdf
    • https://cdn-cms.f-static.net/uploads/4503197/normal_6055137b99151.pdf
    • http://kegodedeta.iblogger.org/98562901895.pdf
    • https://cdn-cms.f-static.net/uploads/4393188/normal_5fdaf5122961d.pdf
    • http://trysalon.xyz/yogurt_griego_alpina_natural_informacion_nutricionalmyfub.pdf
    • http://opssmall.space/charlie_malayalam_movie_hd_imagesx9i2k.pdf
    • https://cdn-cms.f-static.net/uploads/4446016/normal_6019f89087391.pdf
    • http://tuxukimuxegan.22web.org/phrasal_verbs_with_hindi_meaning_and_examples.pdf
    • https://cdn-cms.f-static.net/uploads/4459185/normal_6036212391df3.pdf
    • https://cdn-cms.f-static.net/uploads/4407084/normal_6039b363d4a59.pdf
    • http://creditstar-kabinet.com/zetososisaguretoxabozivl9qa1.pdf
    • http://profapp.pro/gatisurokonizapewufo641gh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/824544d9-ab6b-442b-b3b7-cc28bdf751e0/73012464176.pdf
    • https://uploads.strikinglycdn.com/files/3104e423-b6a0-42d5-aedf-f79765a1037d/integrated_chinese_workbook_answer_key_level_1_part_1.pdf
    • https://uploads.strikinglycdn.com/files/2d8c6847-7cc7-4ba8-8e68-9caea2650491/what_wifi_protected_setup.pdf
    • https://s3.amazonaws.com/gixawetopoli/60972981501.pdf
    • https://s3.amazonaws.com/sitozi/tamexoku.pdf
    • https://uploads.strikinglycdn.com/files/fd8810de-3a43-4244-9df2-a7eae600dde7/19678480440.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f1.bin
a6ed8cb146e323676110a0204ea55fda18ba7c09724fb738a3d899a9421ad6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F1 5324 bytes
font_01_sfnt_off0000f9fc.bin
f090e8d893af5b930ced36193a0c8d1041180e5961f2dbab9c81cd9cdeaeda93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 10456 bytes
font_02_sfnt_off00011dee.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEE 4324 bytes

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