Malicious PDF — malware analysis report

Static analysis result for SHA-256 690b43e8d553a495…

MALICIOUS

PDF

83.9 KB Created: 2021-03-15 21:31:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 43a2de110d663902531fee90ec73aeb0 SHA-1: 5c78d4b5c5571ce443fd346339679b0095423fbe SHA-256: 690b43e8d553a49530905c4c157d17be03e557e9c2db7f903e11c46ed8dace3a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/award?keyword=bolt+clearance+hole+size+chart+metric+pdf PDF link annotation
    • https://riwipawubo.weebly.com/uploads/1/3/1/4/131453561/kowenodojukabafovuk.pdfIn PDF document text
    • http://salet.store/illustrated_baby_nelson_general_pediatricsesprp.pdfIn PDF document text
    • https://cdn.sqhk.co/sisuriwul/fTpyhgC/80063126085.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/bvTe1ih/simosujaf.pdfIn PDF document text
    • http://bio-ita.fun/jelefukureptvn.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/fghhhaZ/dezimovibumenijemenubov.pdfIn PDF document text
    • https://jowetetezuvam.weebly.com/uploads/1/3/4/7/134717416/ec236.pdfIn PDF document text
    • http://terem.space/tornado_definition_deutschuvcd8.pdfIn PDF document text
    • https://cdn.sqhk.co/kivutuzo/giijKji/world_war_heroes_ww2_fps_is_offline.pdfIn PDF document text
    • http://rotiwopofeze.mywebcommunity.org/97932992872.pdfIn PDF document text
    • http://japancar-sib.ru/5556391926q7gt6.pdfIn PDF document text
    • https://numesenara.weebly.com/uploads/1/3/1/0/131069843/a9520.pdfIn PDF document text
    • http://tikonazab.iblogger.org/dd_character_sheet_5e_editable.pdfIn PDF document text
    • https://feliwisinawo.weebly.com/uploads/1/3/1/8/131856919/7744078.pdfIn PDF document text
    • http://gewusoluxul.scienceontheweb.net/67843891871.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/lanorolowu/free_after_effect_template_logo_reveal.pdfIn PDF document text
    • http://zewuvumanoxulo.rf.gd/zunuzojef.pdfIn PDF document text
    • http://wubezirinipo.epizy.com/28785542240.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/80337588481.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/fimano.pdfIn PDF document text
    • http://bupozefi.epizy.com/52972654626.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_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 5492 bytes
SHA-256: 5eba25853768878804e16ed8cf2a6a855ec2304ccdcd302e2bcbacd46836f93e
font_01_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 11156 bytes
SHA-256: b845056fd15a828f4cc1fd10710e07eff1a0ba9ebffd49e0eaf10315d838a416
font_02_sfnt_off00012b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B38 16080 bytes
SHA-256: 419589107fc56601c9b04419f17c215e5f14bb407a84c116f10b58ab6236b798

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