Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c62b58909842efa…

MALICIOUS

PDF

85.7 KB Created: 2021-03-14 10:37:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 055f99161695982d4c805c1f509df0e9 SHA-1: 54c2b67ae439ed1cd44dd724ee922bd24654d956 SHA-256: 4c62b58909842efa7a06d7049b992fe9f2a694ef852b21d84c54eb71dea358ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://fokemale.ru/wix?keyword=translucent+materials+list PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444626/normal_5ff0063e41079.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449172/normal_6007c29691541.pdfIn PDF document text
    • http://anyita.space/gscan2pdf_mac_oso38ij.pdfIn PDF document text
    • http://modernstyle.pro/does_netflix_have_charlie_and_the_chocolate_factoryy53oh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_6029da5c805fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_601ad2f8af5fb.pdfIn PDF document text
    • http://imedo.ru/1266392181ab8wb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444644/normal_5fca6d987e622.pdfIn PDF document text
    • http://kofagurosufo.22web.org/dexerazojulejurodim.pdfIn PDF document text
    • http://afracheat6.xyz/ejemplos_de_actas_de_reunion_de_trabajoygtaf.pdfIn PDF document text
    • http://akmurzina.com/brawl_stars_box_opening_simulator_pcl7p7i.pdfIn PDF document text
    • http://trynon.xyz/fojabofixazakosina2n7t4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tejozusob.rf.gd/31539714131.pdfIn PDF document text
    • http://gokonef.epizy.com/gozugezapejag.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/fingerstyle_guitar_music_sheet.pdfIn PDF document text
    • http://pomigipasa.epizy.com/wekekaxabonarevefuf.pdfIn PDF document text
    • http://newurefaz.epizy.com/android_smart_tv_box_review_x96_mini.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/weather_report_of_bilaspur_haryana_india.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 4896 bytes
SHA-256: 7076c88f382c089981d748f07b98f0dc5be3eba3297e055c24b6c09d077f4320
font_01_sfnt_off0001271a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271A 10208 bytes
SHA-256: a6f6b90b1afce050ceaac8bb7b1feebf289d26b59c65beb4f3481521c62f67db