Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdf34d454aadea3…

MALICIOUS

PDF

77.4 KB Created: 2021-03-25 10:26:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: eca8e5cb91b5c816e08db05996743e9f SHA-1: b2c9181dde0840c472fa90a80ea677f1916e8289 SHA-256: 5fdf34d454aadea343fc271d7d9ecbc84f50ea36fc0397e7a0ef970f9c4480d8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/123?utm_term=open+office+spreadsheet++mac PDF link annotation
    • http://scotiaenlineape-personas.com/fobat8hf8a.pdfIn PDF document text
    • http://jixewelo.scienceontheweb.net/89051874362.pdfIn PDF document text
    • http://newyearshop.site/mafetetuzazamezanavix877sz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464078/normal_602234102d4ea.pdfIn PDF document text
    • http://theraisins.pro/biological_factors_psychology_definitionei9np.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/hhXhii7/45135138279.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388614/normal_60062438c88a2.pdfIn PDF document text
    • http://disozire.mygamesonline.org/dixujemolad.pdfIn PDF document text
    • http://vbruti.site/sindh_high_court_reported_judgements2wsci.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/38427700324.pdfIn PDF document text
    • http://organicnu.info/xegogixusavupedotop0s09d.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/eLjaKgf/wikimedia_commons_paintings.pdfIn PDF document text
    • http://prizinsta365.online/what_to_read_after_percy_jackson_series8q6sz.pdfIn PDF document text
    • http://trendmobile.ru/36244402479bw7be.pdfIn PDF document text
    • http://bilkan.fun/leaves_from_the_vine_violin_sheet_music2nbjp.pdfIn PDF document text
    • http://ranking-se.com/iso_10013_ultima_version1xw8m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474719/normal_6041a000a777f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444358/normal_5fda635d7755e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/aqa_a_level_biology_required_practicals_answers.pdfIn PDF document text
    • http://jokosen.atwebpages.com/what_is_the_best_water_cooler_dispenser_to_buy.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/the_making_of_star_trek_stephen_whitfield.pdfIn PDF document text
    • http://pewubik.atwebpages.com/91438303704.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_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 5388 bytes
SHA-256: 046422dbeeafd8fd28120cc461d97b39910960e14cd2d4d05b33120f376291d2
font_01_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 11260 bytes
SHA-256: 55a88ff59ac1a8c677f12039914d215cf4b23e9621b31676dc2db7b9a787e182

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