Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dba963371967476…

MALICIOUS

PDF

77.0 KB Created: 2021-09-16 04:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29ce4871f3a52068a310f3ebb2282f81 SHA-1: d427c0b73b4b2ca3c390f562c77ab6bee4e68a5a SHA-256: 7dba9633719674765b52a579dd52c0388c0e110979c2f7132668dc208d11d1db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a redirector with UTM parameters, suggesting a phishing or malware distribution lure. The PDF structure and embedded links point towards an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 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://allytemp.ru/uplcv?utm_term=bts+dynamite+song+mp4+free+download PDF link annotation
    • https://rdsdealers.com/ckfinder/userfiles/files/noxelaxutotaloseber.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a84f47e13d6c092aaa64adf3e22e66c2/31967638826.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/70598143657.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/nipezomo.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/70585179250.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/debovixaritinir.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/18951812762.pdfIn PDF document text
    • http://zuche0551.com/upload/file/belazid.pdfIn PDF document text
    • http://jfe.hk/userfiles/36109584753.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/vuduse.pdfIn PDF document text
    • http://kahasat.cz/data/file/bevupako.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210916_A6FC38633328772C.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/mafuzolilofasaribuz.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/57230212515.pdfIn PDF document text
    • https://coluer.ir/documents/file/93512452641.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/mowapev.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/ligazifowamupukunawegej.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/54916541103.pdfIn PDF document text
    • http://jfe.hk/userfiles/dobaranewak.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/22247722495.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea43d3bd68---96139608442.pdfIn PDF document text
    • http://intertravel.hu/_user/file/99468963450.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/gomepogugokisawawamuji.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/xikajirefatifumusul.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/780268396.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_off0000c5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F1 11172 bytes
SHA-256: 11b7445740a0e0ad35862946877b4479289f746d00aaa4bbab01540ea2a4f33f
font_01_sfnt_off0000dff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF9 18136 bytes
SHA-256: 9ce5427652d21fab5d81285f03a8c1de6f6b427704266777479321e1f7b49b9e
font_02_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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