Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b60ca44be55e6b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 22:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f0eefdae65fd9dabee1384a734299dff SHA-1: d0f7ece022200626dd21cf67d2a3c65a4197a12f SHA-256: 07b60ca44be55e6bef955f5f8d121c21361b3f9e239dc31ab3f23764a914eb28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=one+step+equations+with+fractions+worksheet PDF link annotation
    • http://ariogalospspc.lt/userfiles/file/zefasi.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/relemefu.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/77569392217.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/1460194990.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/rifukulukupirab.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/xinoti.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/kafexozeweterinukebunarow.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/91965594786.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/5345910583.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/rubuvubameradadivizefuko.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f48b9e563---68977616056.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/vewerenikazig.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/49840604478.pdfIn PDF document text
    • http://zaiger.ru/img/file/81265247606.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/boruw.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/75868213778.pdfIn PDF document text
    • http://oilspecchem.com/files/jogipebofetisejofizuwowig.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/57996919921.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/zorokogi.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/34422682580.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/71039382903.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210903_3AB91CB7CECE1016.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_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 10980 bytes
SHA-256: 256f7564eacda70a91138266e4d90e5f0833fb0c2a57e73a467efe0606a92af9
font_01_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 18316 bytes
SHA-256: d3116253a348acf7f981084f286231bbc5a19dfb72ef9e09adba4f8a86bb42f2
font_02_sfnt_off00012379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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