Malicious PDF — malware analysis report

Static analysis result for SHA-256 164c2d8dd2f11552…

MALICIOUS

PDF

82.4 KB Created: 2021-05-31 20:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3997308793fede2fbfe827e9454e2ab6 SHA-1: 406094ec6884be4e2db3413405d2e228551e075e SHA-256: 164c2d8dd2f11552117725d319b4448e92225caec7fe971eb5c9e060ecbb6617
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure to a phishing site or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://nipisod.ru/123?utm_term=acting+resume+for+beginners+template PDF link annotation
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/778b6f5a.pdfIn PDF document text
    • https://sepuvoguzunisam.weebly.com/uploads/1/3/4/4/134488558/dolobepukelabuduzex.pdfIn PDF document text
    • https://tuvuneboginat.weebly.com/uploads/1/3/1/6/131606819/45a7d71dc29b.pdfIn PDF document text
    • https://kolajinetam.weebly.com/uploads/1/3/4/5/134584148/92acae4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_60415aaf26d6c.pdfIn PDF document text
    • https://woliwejimagevin.weebly.com/uploads/1/3/4/3/134319070/nudijovager-dajeripid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443624/normal_5fe23b08b8a81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476427/normal_5fd3a1ca59c57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477649/normal_6042c6efd0914.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144422763/vojir.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144418392/xidunozitoxese.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144418746/how_to_put_onn_earbuds_in_pairing_mode.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/xixufulaxonalivumaz.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/18780186917.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/how_to_reset_tzumi_sound_mates_no_buttons.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144414987/ace_combat_7_trigger_x_rosa_fanfiction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/036dda43-8526-4cfd-b273-8b652b78fa17/fituposik.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144415545/2158749847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5efaa703-aa19-43e3-99c3-331df31786bb/autocad_2015_free_download_full_version_2010_with_crack.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144412803/freundlich_adsorption_isotherm_problems.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144412176/fundamentos_de_la_administracion_lourdes_mnch_galindo_jos_garca_martnez.pdfIn PDF document text
    • http://wejojixi.pbworks.com/w/file/fetch/144423549/disisinelilugenagen.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144414993/44500456403.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144416370/4391314096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3221980f-620a-44a2-a930-c0fc641a6f2a/happy_valentines_day_quotes_for_my_sister.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d6b876-fe75-426c-a1ad-2c0ae7bb8021/66843057060.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_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 5464 bytes
SHA-256: cda0b2d5e131a27c829f7f1de8bf27c8696f8e79474d99410fef639c2c576089
font_01_sfnt_off00011530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 11260 bytes
SHA-256: e1afbdf9c7fb4fc1fa3d10bda39a81cca0d357b8a8579ccc145554a04f5aa957