Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d77886eda91a5a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 12:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a2be6c7ebbf43917324ce605e8ef0c4 SHA-1: c4ef2a98a55570671d1ea9bb392cd28d22c4f00c SHA-256: f2d77886eda91a5a5f1a4aa456e0009301f0a133b0d3055b5199e9ea571e0fcd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cosonhuath.com/hinhanh_fckeditor/file/texaxodilajorav.pdf In PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/worodifarasugup.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/30051732234.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/5323630890.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396ee8c7265---22478486006.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/12892538097.pdfIn PDF document text
    • http://lejuriste.ru/files/file/dupogoguduxajigigimunum.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358b03528dd---71501483294.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/rogejurepe.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/55865614906.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/18095047484.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/72576249937.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/wanibofiriz.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/58823044148.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/rebegeruzivoniza.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/39483938011.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/76400345685.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/jonim.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/nalubejepiwikapu.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/xabuvineworenutosuw.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/72962076208.pdfIn PDF document text
    • http://sushi-belovo.ru/files/8870119790.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/gimixekirib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+install+dream+league+soccer+2020PDF 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_off0000d564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD564 17200 bytes
SHA-256: e40f186b85b76ae77ac7e7fe3b94d4b01ac96c106d68c4f5d06c3897c5b1788a
font_01_sfnt_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 11132 bytes
SHA-256: ce587145179ecefe13f4c59c95b22a976cfa9bb1de77d3a9739a96dc1e66cbf6

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