Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d00b31e7d145fd…

MALICIOUS

PDF

69.7 KB Created: 2021-10-09 14:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 77ce3741bc27e7474bbd713d09a6339a SHA-1: b61fc801d83b9fe4d6c2b3e0f671d09300b20a10 SHA-256: d1d00b31e7d145fd00476e40f0fc6862d32b8710e027cdbb561d768b1ddcb7ea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://stonepigments.com/userfiles/file/25873695368.pdf In PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/kifudejazimagek.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/jelowebojonubaxomuvoteri.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/dotituzalizugebirezejumuw.pdfIn PDF document text
    • https://designclarf.it/file/82184316676.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/73390664435.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a66e87233fd5327bc220db759f2c33be/zajugiwivekokas.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615e47ffefa3c---10911989947.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64689226417.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/5322525591.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/94534515027.pdfIn PDF document text
    • http://vhktn.at/images/content/files/tovono.pdfIn PDF document text
    • http://gdgom.com/upload/file/210925065452047421yyktklvlgjrf.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/pomomegiwu.pdfIn PDF document text
    • http://na3.it/misc/file/8217833051.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-01/images/files/jifevo.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/43764941777.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/55671074619.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/96574642283.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210912_F39F48821024C965.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/14815804840.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/dodurilabijuwatatur.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/bexowe.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/22718428481.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/65563567522.pdfIn PDF document text
    • https://datajournonepal.org/files/34658537079.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/79350015416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+do+you+say+in+a+job+interview+about+weaknessesPDF 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_off0000b23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA56 11020 bytes
SHA-256: dd2d51053e5bc0c3a2b66be3b5ea1167af2f6e0cf7a7d5fc5d5bba977941aa7b
font_02_sfnt_off0000e3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F7 14576 bytes
SHA-256: 62243887dbcdb78c1cb5c4e3a6388d12f91aa2a4ecfd23913c53508caa3655d2