Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50c152e107ffa1c…

MALICIOUS

PDF

67.9 KB Created: 2021-09-24 16:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb34fa2334f6e6d44e8917fa5cd7502e SHA-1: 7f16940db8471f8d7717d85dfaf221a0419da453 SHA-256: d50c152e107ffa1cfc88163f6be3c3b3a8741681e4801dbc7068655417015692
154 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 small size, image-heavy content, and clickable action. The document body is heavily obfuscated, but the presence of embedded JavaScript and numerous external URLs, many hosted on disposable domains, strongly suggests it's designed to redirect users to malicious sites for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=calorie+chart+in+gujarati+language+pdf PDF link annotation
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/sepidupinomufopepamo.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/bixufatudenagefatil.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/34458103956.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/xagal.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/58283335892.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/47527644820.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109120929003098.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/30081080614.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/bunibos.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16144ca92751a1---wijonub.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/sezuwik.pdfIn PDF document text
    • http://pronobile.de/catalog/file/86112394311.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1566553146614bd8855b8da.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/77552525983.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/60651508727.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/koselilujuriwo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132515043392---1178979675.pdfIn PDF document text
    • https://aokman-drive.com/d/files/nimolemezagepofixijo.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/72309998245.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/68732227030.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/zuvasavo.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/pugitojubebefupoza.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/73992135025.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_off0000ad5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC571 14032 bytes
SHA-256: 21ea8da5171ccefcd93cf224cf7651097ee47aa815d2c7238fd12289e0a73767
font_02_sfnt_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 10992 bytes
SHA-256: ec0fced786dbd865ea7b4e5cfe1c660bf94de9a0b27712d618042e9b823c8129