Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fa1bea3a841eef…

MALICIOUS

PDF

75.5 KB Created: 2021-03-08 21:05:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 8ffb2facc894c04fe78c45de7b361fb2 SHA-1: 593d560c4c216e097816f3bc2ae03d404fb91818 SHA-256: d8fa1bea3a841eef4c235541976d7f63a9b29de3ffbff0d6c3c817384e35887e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs pointing to disposable domains, indicative of a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/award?keyword=biosecurity+peternakan+unggas+pdf PDF link annotation
    • http://xulubapatoso.scienceontheweb.net/kuravube.pdfIn PDF document text
    • https://cdn.sqhk.co/zukuxenopo/jggdHgd/downrigger_cannon_balls_for_sale.pdfIn PDF document text
    • http://wozekozexufoxol.scienceontheweb.net/how_to_workout_your_inner_thighs_without_equipment.pdfIn PDF document text
    • http://septiki-rf.website/kumaoni_song_bedu_pako_mp3_free_downloadto30q.pdfIn PDF document text
    • http://segaruzobuguses.scienceontheweb.net/lost_ocean_coloring_book_review.pdfIn PDF document text
    • http://mmmuuuue.space/hp_deskjet_970cxibwx9m.pdfIn PDF document text
    • http://pe50off.pro/ropisomewupevawmcir.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/Uy7ifjg/paradise_bird_flower_meme.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/probability_tree_diagram_worksheet_easy.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/58334146102.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e891075-9c34-4d36-981a-35f971632fde/ravopir.pdfIn PDF document text
    • http://rupesujutiwu.myartsonline.com/23877493588.pdfIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/94591695273.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_beb1c754380e4ad0973197a3f6cf7128.pdf?index=trueIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/creating_shared_value_porter_summary.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_8523cf4721614715bff28dd830f12fbc.pdf?index=trueIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_5ff94d5eedd14d15b7a854d2545afa3c.pdf?index=trueIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_7c1fa02038234dbbaa073de2ad7f7f0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97102a52-fc2b-40b5-93aa-e15b1e6b532e/ziwudewesapofu.pdfIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_d24a01c8a38f4de0beae52db1b82380b.pdf?index=trueIn 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_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 5508 bytes
SHA-256: 4937c1c7d7046ad3bcd73ec8c611849a6550113b764f9e2226949dd718991aae
font_01_sfnt_off0000fed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED2 9984 bytes
SHA-256: d62c317cd0b4f18f4437cbef45cf9b6a5f9216a3c3114a2a8c953e325ed7f58a

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