Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5edcfca61b3737f…

MALICIOUS

PDF

74.8 KB Created: 2021-05-11 22:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: eb2a2b273b8a99849f54a9d24302b678 SHA-1: ad004ed1d48719b42f7582b79ad236f56cf075db SHA-256: b5edcfca61b3737f069a689f14df02849882a25523b111700ee717371d0d161e
136 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 high likelihood of malicious intent. The presence of an external URI and an SEO redirector link suggests a phishing or malware distribution lure, likely disguised as a free download. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving embedded links designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=elements+of+technical+writing+style PDF link annotation
    • https://cdn.sqhk.co/xizemeginu/igiAhgy/average_premium_for_home_insurance.pdfIn PDF document text
    • https://cdn.sqhk.co/kerikone/UjahjeC/marktplaats_belgie_adres.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxogife/gcHhbIJ/2205920962.pdfIn PDF document text
    • http://bijeruma.iblogger.org/gidovajafisezolaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/Dotgjge/sutidozekosiwerobabebivo.pdfIn PDF document text
    • https://cdn.sqhk.co/bajilevone/jghhhjb/jujevubovu.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesavif/sKjjQTX/labofumabugavopunorije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_600dde35357da.pdfIn PDF document text
    • https://cdn.sqhk.co/nujudemugipi/y95hjhd/mdacne_dark_spot_remover_south_africa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_6048ac11eb870.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/ahaD0hc/wwe_2k20_universe_mode_draft.pdfIn PDF document text
    • https://cdn.sqhk.co/palugalanivo/qvkjfif/free_wedding_budget_spreadsheet_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxamomajil/49iaMWZ/aimsun_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/gogadibavuta/dciahdG/217425951.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/farowug/15979094548.pdfIn PDF document text
    • http://xodojes.epizy.com/disney_princess_coloring_sheets_free_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/lumolon.pdfIn PDF document text
    • http://sanaxumidi.epizy.com/xatibefu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE804 5444 bytes
SHA-256: f5e8cc01da4ceef4e9c46ede3c8759b770a7c28f597c8b595469953812b0b77a
font_01_sfnt_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 10640 bytes
SHA-256: 51730c3624c1c95a70165f8d7ebe00c1a4412ad45443950669c22e5e7f1c044b

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