Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b30f31ee99f948…

MALICIOUS

PDF

83.9 KB Created: 2021-03-31 10:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 093ee193be2efe578fa276dbab77a26d SHA-1: 508b134e92eef8ffaa66b0ebf7876170362f14dc SHA-256: b3b30f31ee99f948452dee565e9ea6db1f3da902eb962616a1367f7608390cea
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF_SEO_LINK_FARM heuristic suggests a large number of links were generated, likely to obscure malicious destinations or to create a link farm for SEO manipulation, pointing towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=ti-1795sv+user+manual
    • http://ropafumumere.iblogger.org/american_english_file_starter_teacher_s_book_vk.pdf
    • https://cdn.sqhk.co/jexozumumanu/njbboXZ/presentation_format_for_college_students.pdf
    • https://cdn.sqhk.co/tuzojivemepe/hgVWfib/guideone_specialty_mutual_insurance_company.pdf
    • https://cdn.sqhk.co/jajejige/9liKjcb/32294394307.pdf
    • https://cdn.sqhk.co/fejisedetu/hiaaifx/44332077135.pdf
    • http://futiwakeso.22web.org/apocryphal_new_testament.pdf
    • https://cdn.sqhk.co/dagozuwemep/jaGBChb/earthquake_utah_magna.pdf
    • http://laluwaraselolar.mywebcommunity.org/fafabobelewevoditen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_cbfe9b5bb07c4198ab1f526fce0606c8.pdf?index=true
    • http://tosurok.myartsonline.com/8644590346.pdf
    • http://ligexaxo.epizy.com/caa_niquel_copa_98_apk.pdf
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_b14b216031b24e1f848f59d6a13122b1.pdf?index=true
    • http://muviwozusisewer.rf.gd/25828782678.pdf
    • https://uploads.strikinglycdn.com/files/8aade77b-d2c1-46d6-a589-0eda7098ea9a/45763076517.pdf
    • http://lupexur.epizy.com/power_bjt.pdf
    • http://dugexirawotuv.rf.gd/pokemon_go_grunt_guide.pdf
    • https://uploads.strikinglycdn.com/files/c4d041ea-4a37-4f80-bc64-485f3166baa8/gofilijewiroxurijutigone.pdf
    • http://diwigivexuvobe.epizy.com/76648850228.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdd7.bin
e72427b55fe5e1804b29641dd1754311af69eb5440ce3e3a3675b6c130c92f59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 4976 bytes
font_01_sfnt_off00010eaa.bin
ed36a7ee895d3648b3578b33435054b86452ba114487218ceefd5962964ecabb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAA 11196 bytes
font_02_sfnt_off000134cd.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134CD 4324 bytes

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