Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8e3d37d5388af1…

MALICIOUS

PDF

73.8 KB Created: 2021-02-18 19:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8cb4ac11d6221be43c287aa6c58a69a2 SHA-1: 5fc631fad88390b9d07ec90745a6d48b6b1de609 SHA-256: dd8e3d37d5388af1f00a2ad5d3d808ee54969739350c289b18e17e8c47778fff
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical detection for a link farm and a high ML score. It contains numerous external links, with one pointing to a potential phishing or malware distribution site. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the structure suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/123?utm_term=chicago+manual+of+style+annotated+bibliography+format PDF link annotation
    • https://funujitumim.weebly.com/uploads/1/3/5/3/135347265/1088617.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/ibthbzG/ark_survival_evolved_dododex_cheats.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/nogiw_sorig_nuzile.pdfIn PDF document text
    • https://rogupogadagome.weebly.com/uploads/1/3/1/3/131398605/rikafumopafanetiv.pdfIn PDF document text
    • http://acgmgroup.ru/52327890510ymbf2.pdfIn PDF document text
    • https://xapefawisago.weebly.com/uploads/1/3/4/7/134771693/lidizapo-doxajir-jetilemobivoda.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/giatjjy/blackplayer_ex_music_player_apk_20._50.pdfIn PDF document text
    • https://fabezetenonuke.weebly.com/uploads/1/3/4/8/134846610/baponipezo-pevunobarirasa-wosogibogiluxil.pdfIn PDF document text
    • https://cdn.sqhk.co/tobepeliv/geigkid/venogorilopazon.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/zexudagotululoruwezi.pdfIn PDF document text
    • https://cdn.sqhk.co/gedadixugud/3ijY5jf/cnco_members_height.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/wowonesoribu/37140765409.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/72307499777.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/switch_cisco_3750_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/24805590661.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/email_template_creation_software.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_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 5716 bytes
SHA-256: b661633dbf01cb6c5603508104c717ecb289c874a72947234b2366f6a3e156fd
font_01_sfnt_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 10272 bytes
SHA-256: 23cacef6092fc1ac5ba91904a00511c2eb4fe19bef0528b48d807be1e85297aa

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