Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d194c35c561281…

MALICIOUS

PDF

68.9 KB Created: 2021-02-21 16:43:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 66e8bc1094b4c57c44b042096cc6a247 SHA-1: bdf73a7e3b6740a477ca0bfc8928f5f06dca2aac SHA-256: f4d194c35c56128173251ab37cc67e63905a9f046ed8c7f617cc16b66feacfa6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to seemingly benign documents, but one prominent link to 'jottigo.ru' is flagged as unknown and is likely malicious. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan payload. The presence of embedded URLs and a link farm suggests an attempt to distribute further malicious content or engage in SEO manipulation for phishing.

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 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://jottigo.ru/strik?utm_term=metals+handbook+10th+edition+volume+1 PDF link annotation
    • https://dotudamel.weebly.com/uploads/1/3/5/3/135326114/nemiselif-puporokumowixad-kasigewamup-wodemex.pdfIn PDF document text
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/palalezibag.pdfIn PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/sopepokedivigeniga.pdfIn PDF document text
    • https://cdn.sqhk.co/rokijatu/egiVggY/catan_universe_dice_mode_card_stack.pdfIn PDF document text
    • http://help-bluebadgecenter.com/45690330298px8b9.pdfIn PDF document text
    • https://cdn.sqhk.co/texekikevow/h6ig4ig/1986691863.pdfIn PDF document text
    • http://vizezokope.iblogger.org/muninunapizigopek.pdfIn PDF document text
    • http://universal-kirov.ru/communist_adventure_guidevo2pi.pdfIn PDF document text
    • http://vash-fasad.live/speaker_box_designm5ldz.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/gdijc6Z/oldies_radio_stations_60s_70s_80s.pdfIn PDF document text
    • https://cdn.sqhk.co/joxezexukub/iLhdr2K/jodadotum.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/vovuzize/ms_word_business_report_template.pdfIn PDF document text
    • http://sajetubaj.epizy.com/30681171163.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/angry_birds_blast_mod_apk_revdl.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/pipakev.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/61438897758.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/nujemakogi.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/understanding_culture_society_and_politics_books.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/marathi_ganpati_bhajan_songs.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_off0000cf52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF52 5432 bytes
SHA-256: 1681ea5bb5fba138c519d57ce4f4254613bf406b5985049d0c05c1d8b75c3231
font_01_sfnt_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 10584 bytes
SHA-256: 3c9980d05c1a8c69421a2fba5a976372656c36321d40df007301dae5cea8ea16

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