Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ff6cea48cf4630…

MALICIOUS

PDF

75.6 KB Created: 2021-09-13 19:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: b48ff18c07092cfdb77453495a11d2f6 SHA-1: 55f90117d858dbcb819d3a728021b329fad41c47 SHA-256: 10ff6cea48cf4630ceeb7f22b503db4ea7cf980a969be1e4605381828516ab45
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, including a link farm heuristic, suggesting it's designed to redirect users to potentially harmful websites. The primary attack pattern involves using a link farm to obscure the true destination and potentially distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=video+and+photo+editor+apk PDF link annotation
    • http://erpsamik.com/ckfinder/userfiles/files/42982079436.pdfIn PDF document text
    • https://dacola.com/upload/files/zomugopulifuzu.pdfIn PDF document text
    • http://monamifrance.com/FileData/ckfinder/files/20210904_B36B40351240E7EC.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/bofavo.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/donesiro.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/rudegimiwiwarif.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/muruxedurizabarubiluwur.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/24132296725.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/fedesufadiwelafus.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/gekadarobabimumuxa.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/rimisi.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/16650940476.pdfIn PDF document text
    • https://emenu.hu/editor_up/penexapibivumij.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/59633756149.pdfIn PDF document text
    • http://vyrukrc.lt/userfiles/file/60541410550.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/1061582599.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/fosazivaxinebusunopuder.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/gowapukek.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/xudiroturola.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/masevarebogubivomivo.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/35211597476.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/23556212192.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/retexoxut.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_off0000c2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 18248 bytes
SHA-256: 23f792bd2b2fad66d13c2cddb84d4eea20ff094c738c819a9a29173c304693b4
font_02_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 10336 bytes
SHA-256: f6d59f550f7fa594753297764c6b08203f715e675d6a31597eb0a8b9ccdc7ff1

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