Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d92d03b0729e66…

MALICIOUS

PDF

77.1 KB Created: 2021-03-29 07:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 86ae67f61adff32f8c00b24588170648 SHA-1: 309479207047c15dc88d9aecbe2545bdf774a3e1 SHA-256: f7d92d03b0729e66c85202e0bc87f271d1caed682f41755157f97fd439090801
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the ML classifier's high confidence score further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/123?utm_term=calendar+template+july+august+2019 PDF link annotation
    • http://geponimodenebev.22web.org/xepujowalopegelejegurava.pdfIn PDF document text
    • http://rostov-mobile-doctor.ru/ophelia_piano_sheet_music_freehey3d.pdfIn PDF document text
    • https://fifimijo.weebly.com/uploads/1/3/4/7/134748793/49777.pdfIn PDF document text
    • https://cdn.sqhk.co/zokonerozo/cgDgdja/dragon_s_head_golf_course_scorecard.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390383/normal_5fe50efa3b393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_601b66776e748.pdfIn PDF document text
    • https://cdn.sqhk.co/baziwuwe/Rgigche/azhar_movie_video_songs_free.pdfIn PDF document text
    • http://hallop.xyz/what_does_proprietary_estoppel_meanvcphs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_6018d7889e80f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472766/normal_6031f2781f0de.pdfIn PDF document text
    • http://albl.ru/what_documents_do_i_need_to_renew_my_license_in_njb7tny.pdfIn PDF document text
    • https://robivobaxo.weebly.com/uploads/1/3/0/8/130873737/9847321.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/aU7xvBh/bingo_bg_ear_drops_uses.pdfIn PDF document text
    • https://menixikamu.weebly.com/uploads/1/3/1/4/131437341/sadiraje-dubuponepuz.pdfIn PDF document text
    • http://nozekem.iblogger.org/62868663937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481834/normal_601972d775fa1.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/igdjfgf/juximuloluranitigamuwip.pdfIn PDF document text
    • https://pudeputuxokaj.weebly.com/uploads/1/3/5/9/135968230/2300325.pdfIn PDF document text
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/327757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480745/normal_603be00b10377.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuzezufomazo.rf.gd/nexus_4_release_date.pdfIn PDF document text
    • http://matixonapoler.epizy.com/65460773044.pdfIn PDF document text
    • http://wekiwuja.rf.gd/nufukuzitotovoronoku.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_off0000f06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 5844 bytes
SHA-256: 57629e2d4b63cbcf96add4c0fc5417c8f9527ef1c0d07db8332554267caef78a
font_01_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 10132 bytes
SHA-256: da4140dd734834af1f406ec9d2e26c4d38ed9ee378eda6083c24191779332423

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