Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8e7c0a6a302b5d…

MALICIOUS

PDF

68.0 KB Created: 2021-02-02 18:52:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0cfced333bdd6b3914e9f87cd96b4f3e SHA-1: 512049afc94c240f02d54d1222ab8abaf61ff350 SHA-256: 5a8e7c0a6a302b5d0a88a2f107822e0f18cf52c98a37cdfe9e4bdbfcce5a3448
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URIs suggests an attempt to redirect the user to a compromised or malicious site.

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
  • 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://crophysi.ru/aws?utm_term=weather+report+in+shenyang+china PDF link annotation
    • https://lekudelido.weebly.com/uploads/1/3/1/3/131378953/degizatizubexe.pdfIn PDF document text
    • https://didegesub.weebly.com/uploads/1/3/2/6/132681352/joxalafibemiva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381318/normal_5fec88f70b915.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/aihjgig/sling_blade_gif_sound.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458124/normal_5fc98aaf566d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415740/normal_5fe26a1da39dc.pdfIn PDF document text
    • http://suzenax.22web.org/14537381135.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/lDniagj/roku_stick_amazon_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/hhZg4jb/25962477400.pdfIn PDF document text
    • http://fofajofafe.iblogger.org/arabic_alphabet_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vevisadoko.epizy.com/live_tv_channels_app_for_pc.pdfIn PDF document text
    • http://vipuwizu.epizy.com/sowimijonut.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/wagisutufodedefufofepe.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/cockatiel_facts_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/abcdefghijklmnopqrstuvwxyz_video_song_free.pdfIn PDF document text
    • http://jajowisomipuw.epizy.com/bisectors_of_a_parallelogram_form_a_rectangle.pdfIn PDF document text
    • http://popuzavefigud.epizy.com/21588267162.pdfIn PDF document text
    • http://wulitebajanuba.rf.gd/brushless_motor_design_book.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_off0000cd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD57 5280 bytes
SHA-256: 16f95372d22b55f32dc12a583a82b9f9a1337199709528e27250ec90a50c86fb
font_01_sfnt_off0000df60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 10476 bytes
SHA-256: d4fcccddfb618143fa0d972706961a048fadc85da8e31e29f804b899abac1fac

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