Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37a8187056a5a29…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 00:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32692b9b984f44af819c1ff023c1f9cb SHA-1: 9f19b699080a149332594245207e8e135e73bca8 SHA-256: f37a8187056a5a29b3113d82f0b4958a9792f5fc227caf1b680fb50e8a065cfe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a link farm with numerous disposable domains and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document is designed to redirect users to malicious sites. The embedded URLs point to potentially compromised or malicious hosting, further supporting this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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://yyfxsw.com/upload/files/lovesufore.pdf In PDF document text
    • https://vildmarksjagt.dk/userfiles/file/82742472855.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/togojudulawubupifedoga.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/15696281860.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161325da9279aa---63785141587.pdfIn PDF document text
    • http://charontrade.hu/data/file/vuladufufezurezoligonuka.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/zosasobivubufegegu.pdfIn PDF document text
    • http://df-2.de/images/daten/file/57716027274.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/fatipebepakuxosofimikaz.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/wivevo.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/runidefavopewamujafawuma.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccfd4b73b7---52766912048.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/93146437284.pdfIn PDF document text
    • http://abc-tel.ru/data/File/juxilesuponirana.pdfIn PDF document text
    • https://service-panev.com/userfiles/96553125188.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/8044509381.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/48380854032.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/fozipobigesivuno.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/69714004370.pdfIn PDF document text
    • https://tekartltd.com/upload/files/watigewizolegi.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/48182746479.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/fepeto.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/29796892757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=croods+a+new+age+123moviesPDF 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_off0000add0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E2 14576 bytes
SHA-256: 771fcab9eb54e66e6923c7bf16b7f251f45913e4092f3379ce19255d8f5b2bd1
font_02_sfnt_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 10976 bytes
SHA-256: fdf28caf87a9ad968557cd3f86de02e8fbc2ed9819a56b7f74a5f08eac3a2902