Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4c5fa88ae0626d…

MALICIOUS

PDF

87.7 KB Created: 2021-04-07 22:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c55c01944fd6076495378134046be86f SHA-1: 210899dfe6aaec4800caeb9c222c9b6eb05cf506 SHA-256: ed4c5fa88ae0626d9fa57222b8b2ef061c7fdbd92886f25dd03a94c332792de6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the ML classification strongly suggest this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=how+to+write+a+good+legal+memorandum PDF link annotation
    • http://kersita.fun/2579146357n3sgc.pdfIn PDF document text
    • https://wipabobape.weebly.com/uploads/1/3/5/9/135985954/53855e7476e35.pdfIn PDF document text
    • http://clientbluebadge.com/uk_address_format_from_abroadt6iyq.pdfIn PDF document text
    • https://cdn.sqhk.co/mejofiwog/hiihdhb/12468965084.pdfIn PDF document text
    • http://vinograd.io/9562208990v2qg8.pdfIn PDF document text
    • https://lilugotowo.weebly.com/uploads/1/3/2/7/132711957/2ba53608.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/jg5Lgdv/copper_price_chart_2015.pdfIn PDF document text
    • http://gagewetero.iblogger.org/27395601414.pdfIn PDF document text
    • https://pobanuritixejun.weebly.com/uploads/1/3/4/6/134601578/b976ad.pdfIn PDF document text
    • https://cdn.sqhk.co/naxemikomeb/azAtEN1/84233399942.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/biwuxeza-mokitav.pdfIn PDF document text
    • http://hookup666.site/curso_de_ingles_basico_conversacionalt1y6p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pikididubemet.epizy.com/avery_labels_template_2181.pdfIn PDF document text
    • http://sikejilewiz.epizy.com/pajepe.pdfIn PDF document text
    • http://kesewoge.rf.gd/latexol.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/69019714013.pdfIn PDF document text
    • http://venasirurupa.rf.gd/makro_catalogue_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9750d0ae-2b29-4f79-908d-050fbdc650c8/bewujipu.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/28634648832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bcb4a06-a029-46ad-b50d-e519d22b9ef4/50985513798.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 4904 bytes
SHA-256: e06f39904508e7685fcedfc1ac722c4e96b0f79826a45f505c8060272affd3db
font_01_sfnt_off00011f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 10632 bytes
SHA-256: a35b7b9602738add6862cb2d71990e2dfeb03fe3c58acd631e1a7d0db8922c5b
font_02_sfnt_off0001437e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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