Malicious PDF — malware analysis report

Static analysis result for SHA-256 9762e2ec5282f503…

MALICIOUS

PDF

68.2 KB Created: 2021-02-12 18:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3ca466977422a674ef4f71da1c66cb94 SHA-1: 1f38ce96aa8ee65f99fbd1a2db734acd8248a2be SHA-256: 9762e2ec5282f50333108938fc2d689f47094c23bd968e0a1420d040d457bf71
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The primary malicious URL identified is https://crophysi.ru/wb?keyword=audio%20joiner%20apk%20for%20android. The document body, though heavily obfuscated, suggests a lure related to an 'audio joiner apk for android'. No scripts were extracted from this sample, but the presence of malicious links indicates an attempt to redirect the user to a potentially harmful site.

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://crophysi.ru/wb?keyword=audio%20joiner%20apk%20for%20android In PDF document text
    • https://kuxokovu.weebly.com/uploads/1/3/0/7/130738635/3041242.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/buvuvakuxubop.pdfIn PDF document text
    • https://xolijusir.weebly.com/uploads/1/3/4/0/134016651/7459400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417536/normal_5ffa8abbd5117.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486778/normal_6008687f4cd75.pdfIn PDF document text
    • https://petugaxuw.weebly.com/uploads/1/3/5/3/135397026/6760662.pdfIn PDF document text
    • https://rezezeveg.weebly.com/uploads/1/3/1/8/131871466/9805751.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/nemajimo-bomuzo-lisaselel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5fd347b714ca6.pdfIn PDF document text
    • https://puxorubawi.weebly.com/uploads/1/3/5/3/135349856/lufuga.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/mogedozara/coreldraw_x17_free_with_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/all_beautiful_pictures_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/gestational_hypertension_management_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/kivatobe.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/losamokubitew.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/burnaware_free_windows_10_64_bit.pdfIn PDF document text
    • http://kexetuleta.epizy.com/87437177235.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/hypixel_skyblock_fishing_guide.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_off0000cf1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1D 4952 bytes
SHA-256: 2d8e549af14f4fe5a37e9f7a984c1fd385af6100ae62d58a9e8f035dde6a936d
font_01_sfnt_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 10368 bytes
SHA-256: 37dbd7c1e2da8c28d49f615e5543143810e316a8ea2ac0c964971709603eaadf

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