Malicious PDF — malware analysis report

Static analysis result for SHA-256 1683187caac90db6…

MALICIOUS

PDF

67.9 KB Created: 2021-09-25 21:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 47a8eadb5df6b5392a472e3143e82e6b SHA-1: ca5ab38eb217d9073cf7929461b1f0647812d0db SHA-256: 1683187caac90db60bcb597aed1a8ece07c435b6124abc1b53544f5f6db5bf84
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external URLs, including one flagged as algorithmically generated and hosted on disposable infrastructure, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5771

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://laborke.ru/uplcv?utm_term=how+to+scan+qr+code+in+android+phone PDF link annotation
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/38547519629.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/37884786342.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/gixijasudukesarex.pdfIn PDF document text
    • https://apelhijau.com/contents/files/xipimapixi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/h3bqbts5ealiq7jdmkbrbs92t7/detodagekonizotu.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/soduxikepaxepidelewijer.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/7e90c40a05823fb08ca241e3c494a176/75223109770.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/20264328944.pdfIn PDF document text
    • https://dm288.rs/slicice/file/razesezuwumigaze.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/laronefutikuputawezarakun.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/18933548200.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/65917301720.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/xakunisuteb.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/94880547074.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/banisumetogegomujevefak.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/kalemedobuvufuro.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/62832608527.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/85059023540.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/bumelevanomonebigenuwube.pdfIn PDF document text
    • http://jinyezi.cn/upload/megagulodikagarozebin.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/78595498564.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/sofenilaxuv.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/24508696551.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/170784576.pdfIn 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_off0000b34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34F 18488 bytes
SHA-256: 2a6b73279d768e0a3a2a003f5de2859a6712ec98a9600b607ffd46865f69ac55
font_01_sfnt_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 10788 bytes
SHA-256: 38cce32dbe8e35c819fc34b13711ba6cd65ab8ed0af73866a8f68b71eec62cfa

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