Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44043fdc26f5f1f…

MALICIOUS

PDF

84.8 KB Created: 2021-10-04 16:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fa07fe9aba260d0885f16ad16021acc3 SHA-1: acc2d7a2aae118c25c516967f4bf461210fec561 SHA-256: a44043fdc26f5f1fcb591ff00368743b48409ece65c887aa37931ff8fe08fd50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and one heuristic specifically identified it as a link farm on disposable hosting. While no scripts were directly extracted, the nature of the embedded URLs suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ageofwonders.buka.ru/sadm_files/53298800007.pdf In PDF document text
    • http://daiichilogistics.com/uploads/news_file/96636369327.pdfIn PDF document text
    • https://nesselaarbestratingen.nl/plaatjes/file/80832794798.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/42736406486.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/bilefepawutodabubunax.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/68637516564.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/55264746370.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/wuzamosoluxonisuzis.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630543941/files/firetomenedarilubisizoka.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20211003143445.pdfIn PDF document text
    • https://tigaintan.com/contents/files/95348558122.pdfIn PDF document text
    • http://soles2walk.com/data/file/97308235783.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/litupe.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/loboxurimawonevizudebofar.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/rodegesaresevipisawiw.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/33496401631.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/bakomilareb.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/xiwatovex.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/17583311487.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d085feadb086d53e7783c95cf2b3c945/nusexurarimuxarekep.pdfIn PDF document text
    • http://balone.net/_upload/file///rapuwixefukajufo.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/kegudefopelofasegin.pdfIn PDF document text
    • http://jonme.net/ckupload/files/nukubogunobixanusezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=excel+scatter+plot+multiple+xy+pairsPDF 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_off0000df09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 20136 bytes
SHA-256: 7d2981c4bad30f290eae15e18adc5ed8c83897c27d2895941e5a8c69a1973f2b
font_01_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 10728 bytes
SHA-256: fa345b59da3dbf7e4e1a9aa6ba6381ae687c2172f2973b134a85d8515e6b3ee3
font_02_sfnt_off00012be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1