Malicious PDF — malware analysis report

Static analysis result for SHA-256 572a1a8d195d69e3…

MALICIOUS

PDF

75.0 KB Created: 2021-09-21 01:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f9a7d293b2978a1c735de7a6529f788 SHA-1: ff0c241a73141d5b7ecd6214d18c153bcd53b7ee SHA-256: 572a1a8d195d69e3a1635589a4367b575444a447c2c9b37a70ab91c76e5b5d67
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown reputation URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://cameralehiep.com/hinhanh_fckeditor/file/rosiporipajedip.pdf In PDF document text
    • https://scalper.ir/data/files/file/zunilukotivego.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/nigubavuzopib.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/nifotoramagilabod.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/ritijudewogesirijikiletiv.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/novefavuxa.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/25213197747.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/fewidujojepa.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/74265246635.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/94935062770.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/zosupokotanepemuxu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16146ca3f46325---36232383349.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/jujaxir.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/34104736494.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/63203910915.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/34903143091.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/lolamejefimopixotomomu.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/pifukogejajulusojiw.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/gelunukidewazuro.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/razuralexeniwagugolar.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109152251463855.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135bce13769a---19778776757.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/duvufegodujozepumo.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/93575217335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=full+hd+wallpaper+download+for+androidPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/88220243715.pdfIn PDF document text
    • 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_off0000c28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 10492 bytes
SHA-256: fc20c5777a87e20e2155b552ad4274488fe55dc15dc6c14d95e1e31151aaf58f
font_02_sfnt_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 17380 bytes
SHA-256: a4407ffc00fc4107110ff960237c4767e842ee436dcd7614bc9b63dcbe621e05