Malicious PDF — malware analysis report

Static analysis result for SHA-256 52da7ecdf96cba51…

MALICIOUS

PDF

118.9 KB Created: 2021-04-09 06:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: de2f1c3407f802f2277038481047bbd8 SHA-1: 0592dfe61c2c52846ac49e895007f21f9047b524 SHA-256: 52da7ecdf96cba512103d59ab42f1098b3218b3721dc7112e1912103241a0107
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical ClamAV detection and ML classifier flagging it as malicious. The document body, though heavily obfuscated, contains a question that acts as a lure, directing users towards suspicious domains like vilenefex.ru. The presence of numerous disposable hosting links suggests a phishing or malware distribution campaign.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://vilenefex.ru/strik?utm_term=what+is+the+number+555+divisible+by PDF link annotation
    • https://cdn.sqhk.co/wuvukidovime/ihlvBgg/bezubuxumij.pdfIn PDF document text
    • http://sawotawigusewon.22web.org/lifama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456166/normal_60391ecf69c34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446511/normal_6054f3f52bd7a.pdfIn PDF document text
    • http://vajamerafimal.iblogger.org/free_online_historical_fiction_short_stories.pdfIn PDF document text
    • http://fruit-ita.fun/nerifopegeziviv4iscb.pdfIn PDF document text
    • http://xitnet.fun/what_is_optimal_level_in_nutritionpa7rz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407066/normal_600167c04edee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483346/normal_606e2235af30c.pdfIn PDF document text
    • http://flowerport.shop/zudagowudaragarsu812.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwolegu/gici0gh/vuxeradomononogozokes.pdfIn PDF document text
    • https://cdn.sqhk.co/sokulutesi/fjd8Pje/drum_sets_for_beginners.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/ece01ccd-9915-414a-a3ac-06a32dc8b5db/garexanelibifegewonivi.pdfIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_8f854dd4ec6c4f019bf439c9e91b5c47.pdf?index=trueIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_ed6c1faeb2964ba79b03255cfb55b61e.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_4f4045d674844d5b9a856b92fb3a5878.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a007cc88-0a45-4f0d-ab75-4a62cf5ffcef/windows_7_professional_keyboard_shortcuts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1e7826-4986-4194-840d-ec54069c62fd/98231317304.pdfIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_2c23bd1e9c4648dba4e8d9bbfdbd8efc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/416e76df-2b63-4ab9-a56e-db9936428a65/35945982401.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CA5 5504 bytes
SHA-256: a7be6ee0baf016b6af5f954fee20e49911f58df3c6e62ee11bff2836906c7328
font_01_sfnt_off00018f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F47 12244 bytes
SHA-256: 9d6c6ff93802047a45af1162e279a04a886258f25479f387c027b4bc8277aa97
font_02_sfnt_off0001b8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8AB 16116 bytes
SHA-256: 695712d5df92d2eed50b4f9eb982b07b0a6b62ac427b7a93fdc6d43ac1f200b5

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