Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e78b3a902f5a34d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 11:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77d3f12b3d8b4875eb41a4bd63941ea5 SHA-1: de769c315e5494b76b0d207e06676ab12df1996f SHA-256: 2e78b3a902f5a34dd83de32fd497d7629058581ec90f62ab3db9848277957342
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including one pointing to a link farm, suggests a phishing or content-luring attack. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the document as a link farm on disposable hosting, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://swaving-stalinrichting.nl/ckfinder/userfiles/files/gumapufuluxabiped.pdf In PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/dalufezurisor.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/mixevozavalixoda.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/65615646941.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/66421781028.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/tofevuwejorirejidegaziz.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/75481808764.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132f05590bdf---60060900131.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/2619220455.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/46538411504.pdfIn PDF document text
    • https://securitydm.net/slicice/file/nagetavaxa.pdfIn PDF document text
    • http://www.uds-myanmar.com/image/upload/File/20032448063.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/zikukugoru.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/35594510932.pdfIn PDF document text
    • http://scsychem.com/upload/files/damorimadapolupa.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/57602591172.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/83787044185.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/9853888527.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/badulorobanadi.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/44704177128.pdfIn PDF document text
    • https://schmitz.cz/res/file/lekolajateto.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/e735342f1c8a4f523bf43ef643c84638/26823758949.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/57069713311.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/71538532745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=temple+run+2+unlimited+moneyPDF 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_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 16988 bytes
SHA-256: 9cad27d05863623aa4b4f930024f59c796c926cfa208a8683a5fd3197870ec9b
font_01_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 10520 bytes
SHA-256: 6aff6ecb90c46903df428294fbe5656d4cbd0516274dcf8528d98444025c17e1
font_02_sfnt_off00012380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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