Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d2c964f724b1f1…

MALICIOUS

PDF

85.1 KB Created: 2021-09-13 22:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c85cfb2711469e68f6bedbb88aecfbfd SHA-1: aa4000db6f161083624641b95e759402e7f1aa87 SHA-256: 04d2c964f724b1f1a8e61b76b77049bd4fbb45f545ef1ed4cec7c3795a9b3e5e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are structured as link farms and point to disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. Although no scripts were explicitly extracted, the PDF's malformed stream and ML classification strongly suggest malicious active content, likely JavaScript, is present and intended to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://archism.ru/uplcv?utm_term=farming+simulator+19+mobile+download+android PDF link annotation
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/2b1c82abe6964998dbdb959faa528d03/9963432344.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/32237614851.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6aacdcf56---65141093981.pdfIn PDF document text
    • https://digireg.com/upload/12018304593.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/bedom.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/metesaropozukaxubelelirib.pdfIn PDF document text
    • http://chinalabware.es/d/files/85296850237.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/lisixad.pdfIn PDF document text
    • http://autovoda.ru/upload/files/tezamupugeregaxine.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///vogabonej.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/fosodivitom.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/xixiladoreg.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/29858310226.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/68056215998.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/gerikototerowoxokobivev.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/68034065292.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/rawilabogomipo.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/pidedalarovuxatogoguga.pdfIn PDF document text
    • https://oferta.lt/i/File/lizojimusoraroku.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210910225521.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/togutelofunatesogop.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/81618129923.pdfIn PDF document text
    • http://e-sportis.com/images/upload/41251835375.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/toxamutimojorude.pdfIn PDF document text
    • http://sbairs.com/datas/files/5457587885.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://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_off0000e4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 11116 bytes
SHA-256: 9038c897a1a42511ce1d0316ffa0ccb9be897b6a1c64ed7a3a866ab9c06d1730
font_02_sfnt_off000116c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 17652 bytes
SHA-256: 58c5dc7321b7af80278f8d849294a7150c10c23477fd334c280f271febf98420

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