Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5254df9118b56c…

MALICIOUS

PDF

67.7 KB Created: 2021-01-16 01:12:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a1eb3df5338a9cb11a32851a9362c029 SHA-1: bfa8a1a11598311aabbc5941f7ac0a3da24c9e33 SHA-256: ad5254df9118b56cb217f9da691129b4bb29aa94d2b937cd7ffd78d6d77cc1ae
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'how to draw fortnite'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=how+to+draw+fortnite In PDF document text
    • https://dunawotota.weebly.com/uploads/1/3/1/4/131438316/8249522.pdfIn PDF document text
    • https://kuburabet.weebly.com/uploads/1/3/4/3/134362545/2550996.pdfIn PDF document text
    • https://wixolovab.weebly.com/uploads/1/3/0/7/130776385/sujefiselavif-voxarixizij-kukege.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/ij7OjbE/puwijoge.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/UXELqhG/tiny_battleground_mod.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/nijofazokexoxelaneno.pdfIn PDF document text
    • https://zolerowiz.weebly.com/uploads/1/3/4/6/134691656/vikajur.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/6481d60cee89d9f.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalijit/dhvjbuJ/restricted_app_screen_recorder_apk.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/gazivemon/womababuxevupepasut.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/xorexuvinebunafunelo.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/magazine_layout_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/eular_guidelines_gout_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/ziwanazafut.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_off0000cff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF3 4744 bytes
SHA-256: 5f6fb724aefa15c37c34dda3d243d344cbb7e9f3a286d87fc971f26c87bd16b3
font_01_sfnt_off0000e034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE034 9912 bytes
SHA-256: dc764d539083bc34c67aaea5d79fe61b3e7a9a969ee6f05c0a9584a9915dfe4e

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