Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac87580864f1ca29…

MALICIOUS

PDF

68.5 KB Created: 2021-09-28 18:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b09cb5e6533914cff9e57763e5c0cd75 SHA-1: 6d3d06128495984bf808ca2a763dd77adb030b9d SHA-256: ac87580864f1ca29a9de2cfc2feaf03f4398c5a89abcaeb31e07f38081965848
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure due to its image-only nature and clickable action. It also contains numerous external URIs, including one pointing to an IP address, suggesting it's part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://wastran.ru/uplcv?utm_term=android+google+login+get+access+token PDF link annotation
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tidovokerevi.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/21487175736.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210909205719649.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/zovekukazaxeletuxi.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/54983620843.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/dojibi.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/jatikori.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/nujakuredorugagisu.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/73928923921.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/duwizafibokol.pdfIn PDF document text
    • http://drironcat.com/images/file/religanogoroxikudobega.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/74445750259.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/71828917166.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/95214691199.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/galef.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/vasusupek.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/48408051502.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/lomupaxakuxige.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/golanaviw.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/vejoredubebevemalan.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/82279901315.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/safojupejadebo.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/27440809441.pdfIn PDF document text
    • http://julianina.de/upload/file/gokalunegoxitaraviwewatit.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/53115931961.pdfPDF link annotation
    • http://ukkies.be/userfiles/file/jixatokojasabominera.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_off0000af9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B3 10620 bytes
SHA-256: 732413841b3dfdd0d19b3eb354f019b050c26c23102afb40bbf0ea23d39ff3aa
font_02_sfnt_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 13960 bytes
SHA-256: 88195c2acf20cdc6519881258352bf908c343431b2d3decebe3a9303af9615f2

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