Malicious PDF — malware analysis report

Static analysis result for SHA-256 b712a7253e1a2603…

MALICIOUS

PDF

72.7 KB Created: 2021-09-08 12:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a879ad12b8248b6004a71b0fd0feb31 SHA-1: c2e67e0671d5f178fae9a77a2f076dc33c559560 SHA-256: b712a7253e1a2603b1273e83845f6b55b4d285d9c45963ff8794ce9224400b3e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of multiple unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://kangmeideyiliao.com/uploadfile/file///2021090623051199.pdf In PDF document text
    • http://busankid.com/webfiles/board/file///dowotegino.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/99433210058.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/612ee18ccdfed.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109060943094059.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/wofiniviluteganoruk.pdfIn PDF document text
    • http://hanshintech.net/data/file/winimejotez.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feeee1ed90---96317647452.pdfIn PDF document text
    • https://pcetravel.com/files/file/vutazekaduzupiwikepax.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/99982433576.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/4308784533.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/61351966416.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/20952421876.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/27358231608.pdfIn PDF document text
    • http://ashioke.com/images/library/File/96302758236.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/geguwusozifid.pdfIn PDF document text
    • https://computerzone.pk/file/lupewenixugako.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///89648322172.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/18433289916.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/5349907458.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/35552357652.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/kopim.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/lubefijaji.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/kurijukonamabedutasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ancient+china+xia+shang+and+zhou+dynasties+worksheetPDF 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_off0000b9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C2 16056 bytes
SHA-256: fd6c773252490299ed4e316a1290fc772f75170d9569e66efdc1640e61c8db8d
font_01_sfnt_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 11136 bytes
SHA-256: 3cd6caf1e87c1ee3ab442ef25622e27f7a9a5e0ec9c5dc5f0ff1fec73fb3d72f
font_02_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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