Malicious PDF — malware analysis report

Static analysis result for SHA-256 90846495bb4201a8…

MALICIOUS

PDF

75.3 KB Created: 2021-03-19 09:12:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7c3a2e44b5997a741f4cb65779b88ac4 SHA-1: a56d5b0f1cd2fd7eff6824e383ba346fc824273f SHA-256: 90846495bb4201a8ee89ffc959991dc2754960eecbcd27f6dd1574a9696c5f04
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing infrastructure. The PDF structure and embedded links point towards a spearphishing attachment attack pattern, aiming to redirect users to potentially harmful websites.

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://druttle.ru/strik?utm_term=kero+sun+radiant+101 PDF link annotation
    • http://legiontry.online/dewalt_745-xe_reviewjgxy1.pdfIn PDF document text
    • http://zipekapivan.22web.org/calculus_3_exam_1.pdfIn PDF document text
    • http://interior.estate/xavejuvewa9cphi.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/ie73jfJ/new_york_times_newspaper_owner.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/mubikemamobufovowaqhhi5.pdfIn PDF document text
    • http://heartcenteredequestrian.com/15005170656wuq0o.pdfIn PDF document text
    • http://regoxudidalu.22web.org/45348026296.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/f5gihjb/beast_quest_switch_ign.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dowirefe.rf.gd/booz_allen_hamilton_email_address_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b081f89-9526-4984-baf0-4f43656c7ba3/peziwutotojiku.pdfIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_b551882fda9040259147abf263db9212.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/howrah_weather_report_video.pdfIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_4c4fa50ccfd74288a1e11e21e6bb56cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/57639031400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6652a578-3d57-4564-a8c2-b5373710d5a1/36110551681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43e28198-797d-46b3-b9e5-84f5d940d627/46211657672.pdfIn PDF document text
    • http://kudugumokob.epizy.com/dnd_5e_fighter_battle_master_build.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_off0000d303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD303 4952 bytes
SHA-256: 2786937aad70c80820df8e9f7d32cad3f6b428e42aeb8619fd5a9533c994e0a0
font_01_sfnt_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 11276 bytes
SHA-256: 381832eee82b03762aa17475691f93819f291b07e6432187233772aa068573e2
font_02_sfnt_off00010a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A65 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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