Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27f1f7e5dc685c3…

MALICIOUS

PDF

78.4 KB Created: 2021-01-25 16:07:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7b77877369571282c6c29503fa674943 SHA-1: 2d011402a06a6c423d5360169ab80df1cf5a409c SHA-256: c27f1f7e5dc685c3e36b3cddd1c8ea1fa693a2ebb9e98e55bd6331683c0d91a9
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious content. The heuristic 'SE_INVOICE_LURE' suggests the document's content is intended to deceive users into clicking these links, possibly by impersonating an invoice or calendar. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://baarspo.ru/aws?utm_term=calendar+2019+festival+list+pdf PDF link annotation
    • https://safupoxex.weebly.com/uploads/1/3/2/6/132683070/vazamidudetujosoweg.pdfIn PDF document text
    • https://totidulabi.weebly.com/uploads/1/3/1/6/131606487/684744.pdfIn PDF document text
    • http://lumacy.site/chickamauga_battlefield_marathon_course0zqi4.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/gcicjix/zikibenupimedoga.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/aejehjv/do_not_touch_baby_sea_turtles.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378383/normal_600317ff02066.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/jiDDjb4/zudupadezurewow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415524/normal_5ffa979b41a30.pdfIn PDF document text
    • https://mopomavimixefor.weebly.com/uploads/1/3/1/1/131164117/vetawakumuvosarum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443357/normal_5ffdae595ae3f.pdfIn PDF document text
    • http://vnds-v.website/flappy_dunk_score_hackkfxww.pdfIn PDF document text
    • https://juwujumatel.weebly.com/uploads/1/3/4/0/134042908/bebatago_virixejojus_figuwev.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/8754019.pdfIn PDF document text
    • http://gallery-shop.site/pizupexpybv.pdfIn PDF document text
    • http://fupomogusi.22web.org/xopisazuvoxinobuvekamin.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/c7jbbie/steelseries_aerox_3_wired.pdfIn PDF document text
    • http://wuxifev.iblogger.org/bhoothnath_returns_movie_song.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/jowinuxusovitexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xilavivugup.epizy.com/living_things_reproduce_worksheets.pdfIn PDF document text
    • http://bopuxenuxesozu.rf.gd/1844478173.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_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 5480 bytes
SHA-256: 00ca1f1a59cbf266e703591f93e4c7535bb3656ffcd4020e3e396f95ccd4712f
font_01_sfnt_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 10756 bytes
SHA-256: fda6d76d79f2ef4b95e7fe44763d35ec53f8977f4517a36507ed26c0a330243b

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