Malicious PDF — malware analysis report

Static analysis result for SHA-256 15fdbc00cec45f9f…

MALICIOUS

PDF

73.8 KB Created: 2021-09-19 14:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0a44c835408f8cd233ff39b36bdd5317 SHA-1: 18e344807072aa5cfed32599a71fbe23473041cf SHA-256: 15fdbc00cec45f9f91fd44ed95d2099b8f310c0d684b3753f917207a4001f24f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dfanchem.com/upload/files/laxikalavejojopu.pdf In PDF document text
    • http://chip-chup.hu/upload/file/54482890770.pdfIn PDF document text
    • http://netart.hu/userfiles/file/gotifegezotof.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/6762692689.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/vinelamubaladu.pdfIn PDF document text
    • http://foodchemsino.com/d/files/toderowadomadapuwal.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/94298151776.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/68261480891.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/42299287829.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/1563887597.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/zimufefurep.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/8809671734.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/97651866811.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/48186622677.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/05360ebd45bfe49d82be92af746ca32f/44344457061.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/valifajanunegu.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/dirukuf.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/putifidulexuzox.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/mujur.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/72462679028.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/wodosefowigegelo.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/83266096394.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/wozerujibenopi.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16143fb62d7930---37171496985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=wifi+hotspot+games+for+androidPDF 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_off0000bb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB85 10892 bytes
SHA-256: 34177142d36b675a6bc52f86a088b2e7ebe409c0ebf496e6930090d810579e38
font_01_sfnt_off0000d45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 17392 bytes
SHA-256: bc069515589c4f59f634a822bf70201312384ec3f87e9faf7f88cd3e085153dc
font_02_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1