Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc23ddd96970a94…

MALICIOUS

PDF

68.8 KB Created: 2021-03-29 12:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8bbffd675640fe10b168a767ce4d88ed SHA-1: bad52ca2805f2f59d444536e8d4b6a708804d353 SHA-256: 4fc23ddd96970a9401911ae533e6d0104c5e5bf9ed7d236ca28baa4c66f331d2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, contains text related to song lyrics, suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://maypoin.ru/strik?utm_term=somewhere+over+the+rainbow+lyrics+eva+cassidy+chords PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479905/normal_5fed91776f7f1.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/tSCjefI/jutamedejura.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413697/normal_60058ce878586.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/25f1b2a9.pdfIn PDF document text
    • http://juilopkiretlo.ru/99345448312sufaz.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoposuj/iaIUjgA/the_legacy_golf_club_resort.pdfIn PDF document text
    • http://wowitaly.space/new_york_state_of_mind_piano_sheet_music_freeee2ls.pdfIn PDF document text
    • https://komutezux.weebly.com/uploads/1/3/1/3/131398036/vekudolodupefeba.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/guraxatu-xuwaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458145/normal_5ff0df48cb0fb.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/dkgjihE/82807652722.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/agj9Ohi/jeregapefefig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fivamoxopel.epizy.com/15951701483.pdfIn PDF document text
    • http://tinosizifaxuful.epizy.com/26522168762.pdfIn PDF document text
    • http://latowetutut.epizy.com/97876915179.pdfIn PDF document text
    • http://ximigatoma.rf.gd/66175248791.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/95890414906.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/8486510071.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_off0000cecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECF 5676 bytes
SHA-256: bc340ce12ab9f8ca3153c48230955907283f018367ddd0bfb1648b313c2eb731
font_01_sfnt_off0000e20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20A 10408 bytes
SHA-256: b7c43b3aa08dda25184b03dcbadf79a7edebaf38b73c4bc02fa5a0b5b26faaaa

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