Malicious PDF — malware analysis report

Static analysis result for SHA-256 da35b317a0587d15…

MALICIOUS

PDF

88.3 KB Created: 2021-09-14 05:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 779596caa518e7606bd41708d4265185 SHA-1: 9900bafb6fb0fe7cc6f45b401cf727751654cb51 SHA-256: da35b317a0587d155401e7a4331f62650cc3b41d70b2cbad1c6c6b8014b54390
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a link farm or SEO poisoning attempt. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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
  • 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://funbugs.ie/userfiles/file/folinuvewemisaveledujatad.pdf In PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/66986788574.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/19483313171.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/94527321732.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0qe0vmo48ur2j6m3fgnnfoh9h7/97253018141.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/79085872358.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/fividij.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/bavitivutunozip.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/62973389530.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/pabononube.pdfIn PDF document text
    • http://bjallstar.com/upload/file/15991057621.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3c972ccd4d768e0a76c9e8f94f272d4c/31146353449.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210907_B111DE73273A3C12.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/tatiwidedirovirinubelareg.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/dimenuwa.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/dapibupamoforegevexa.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/vevetoniburi.pdfIn PDF document text
    • http://shamayachts.com/upload/file/7983545215.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/70686741788.pdfIn PDF document text
    • https://deepex.hu/hirek/files/vusujirivevawebimifevuva.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/14053244676.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/58851824451.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/digutikinapimibiropixa.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/guropudamato.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/4052455300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=game+of+thrones+libro+1+pdfPDF 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://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_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 10992 bytes
SHA-256: 5abfcd909aeabe0dd5b5b94f4bd63cb83227caacac1d66f2330e02e08415cbcc
font_01_sfnt_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AB 18080 bytes
SHA-256: 77fc82eef29d4b7983ea766b6fc9734d961a3f152ebfce9e374a61d70d33628a

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