Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9b0fd30b74759d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 09:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7778d8bbd7819b644b917d39ef8aa344 SHA-1: 875249b6f97c35c97c6792d8d22302bd1f87b885 SHA-256: cc9b0fd30b74759d40b8aacf724489d4f2df7e7300eebc7d75d6efa7b313f303
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown domains, and one heuristic specifically flags it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://anakmeong.com/contents/files/netunujosidasaderewi.pdf In PDF document text
    • https://bruceautoservice.com/files/file/48995368151.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/95443966925.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/94518131711.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/bibapuwiz.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/tegonu.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/99405573691.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/vokuzidasuzi.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/giwutowipagoxemide.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/92841699586.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/xojizugaviredasonijawawu.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/jerewu.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/60202816844.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/jajekowasekida.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/36307007308.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/rusisejuvorafitupomufisap.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161365182311f7---24670069071.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1630952346.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/regodixowagalojobusigom.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/mezurixi.pdfIn PDF document text
    • https://alutat.com/data/file/bijuzapak.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe33969505---37319748448.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/38608733556.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/sukunaloduwakutowif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=apps+like+parallel+space+for+pcPDF 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_off0000d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD988 16848 bytes
SHA-256: 1bf5153c31a3f1c4ac3575136d4fd06d4b82699220607f01bde7a228c66609da
font_01_sfnt_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 10344 bytes
SHA-256: b9e93f4be8def8866ae94cb8f170b86f3e401a3a22c62e49666502f337272955
font_02_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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