Malicious PDF — malware analysis report

Static analysis result for SHA-256 f459f5424077a8da…

MALICIOUS

PDF

78.3 KB Created: 2021-02-22 13:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1e6f4b94fbe36a5278e1d87428a922f3 SHA-1: 0ab3b10cb5284f2cafafb23ec6465f64032413d2 SHA-256: f459f5424077a8da3b6507435fa463b70b8666c565326d9bf11d576eb56b5d84
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jottigo.ru/wb?keyword=scunci%20steamer%20manual%20pdf PDF link annotation
    • https://sinaxerepedosuj.weebly.com/uploads/1/3/1/3/131398545/5390971.pdfIn PDF document text
    • https://rarozevalir.weebly.com/uploads/1/3/1/4/131437937/dutepaxawitofut.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/gjiegic/target_sniper_3d_shooting_games_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nixagigad/jhhlhf1/arkadelphia_high_school_football_roster.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/ghicifs/sanigarulizudaxagebifa.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/xavevoxoxasalopo.pdfIn PDF document text
    • https://cdn.sqhk.co/belexewuwif/hc1iihi/telehealth_services_and_the_medicare_program.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/hf4Ug5c/diloritumirujuvapasutowen.pdfIn PDF document text
    • https://rabusefikitane.weebly.com/uploads/1/3/5/3/135314736/xamufasupo.pdfIn PDF document text
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/tebatamubozag_mudawagafitibiw_welerufufagaba.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/Ycij3gf/digital_marketing_strategy_course_london.pdfIn PDF document text
    • https://mutimerujufidi.weebly.com/uploads/1/3/4/5/134526942/ef3338943e253.pdfIn PDF document text
    • https://jumuvive.weebly.com/uploads/1/3/0/7/130776409/gavagozikonakan.pdfIn PDF document text
    • https://fufuwotasivixi.weebly.com/uploads/1/3/5/9/135966690/912355eb007.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/uthfhdv/n64_emulator_ios_download.pdfIn PDF document text
    • https://mesirurot.weebly.com/uploads/1/3/4/7/134706751/a352832e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • 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_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 5404 bytes
SHA-256: ed2b0179ac4e2054e41f1f77acd9a1bc90466d868098e1e217c206c416fb6ace
font_01_sfnt_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 11476 bytes
SHA-256: 3029107bcb49e1ffb66327025eac7222710f48a54804947693635faa1a851c3c
font_02_sfnt_off00011197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11197 17520 bytes
SHA-256: 5ba49ea6635bcf5a39b28bddec311287fd864d04bb5f80edcfcfab4432d73cd4

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