Malicious PDF — malware analysis report

Static analysis result for SHA-256 5566fd344d286de8…

MALICIOUS

PDF

87.3 KB Created: 2021-09-19 03:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e7af35ae932789e71fd0b7036ba9d9a SHA-1: c3dc88bf7e1ba11c18cde048a56daee432223c90 SHA-256: 5566fd344d286de8ca24b4c38355027c8460325e4710534d1d1d2611da201967
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous disposable hosts, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing lure, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://cameranichietsu.com/luutru/files/ziriboxamomobaga.pdf In PDF document text
    • http://snft.ro/media/file/tokukirokepitatugi.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/48510394040.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/womogubujadu.pdfIn PDF document text
    • http://school15-tyumen.ru/f/36477745656.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/rusiwalojinomunarap.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/49367457907.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/35095127892.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/80066689082.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/17506028860.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/74498716407.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/polusalojagufidana.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fde6e2c98---vojekelatedox.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/mewododefurigiridolona.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/roxokilorefabuwilufefos.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/wapupinajovosanuvorup.pdfIn PDF document text
    • http://chromavials.com/d/files/75227475106.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/xizujezaxemenog.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/jarovuvetazo.pdfIn PDF document text
    • https://12shio1.com/contents/files/vewur.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/46922806232.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/nesoferuzunoxuveg.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/2936575357.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/fofokuforomida.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/59788233351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=showbox+on+android+tv+boxPDF link annotation
    • 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://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_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 10468 bytes
SHA-256: 730690be7ae580ca833e397ffe644b6b05ea7bf770bf16e18f5b54973448bfa4
font_02_sfnt_off00011fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB7 18644 bytes
SHA-256: 10ab496ee68531140f218baee4b235910d46f6667390782ceda8347fef36ca23