Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c1c563b33a5e27…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 10:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05909b37a000d68113af6e83c91513c1 SHA-1: 8f8f32f3ae55f886f216587e802fc576996df7fd SHA-256: 00c1c563b33a5e27f95e149c4ab5f667c3885c12ded8a98385beae4a08f749bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct, potentially disposable hosts to host PDF files, suggesting an attempt to obscure malicious destinations. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it is used as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mengnuanua.com/app/webroot/files/files/taziwenogatoxazoto.pdf In PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/98789424590.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210907233133.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/43189748376.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zifisupuzoz.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/30191557663.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/gorujetuzixepomob.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210904205931.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/wapibibogif.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/tirokalatu.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/vivuli.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219151436323611.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/zilexines.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210919_73224F368DA38F99.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/5177032194.pdfIn PDF document text
    • https://ckmandarin.com/uploads/ruxemoxujitekedipoj.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/binejadofopexe.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/wanowodafekevafo.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/bifedugiwawof.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/sowawujuzigamasukekos.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/nezepi.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/84659252387.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/diwepubegilusolufapolajom.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210906202352.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/natotofesijesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=take+a+screen+shot+on+android+phonePDF 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_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 10620 bytes
SHA-256: ffb7b044a94779ccbb23ab249beb8f993d000071beabe774b39383c02dc2c02a
font_01_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 17620 bytes
SHA-256: 6c0ea58c0eee2ebbcb0b6366957ab9e8804ad8a2b3f432399e2ca5c79a1c67fa
font_02_sfnt_off000131f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1