Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f139bd381b48999…

MALICIOUS

PDF

67.6 KB Created: 2021-03-07 04:30:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 19581e532539f22bf28285af4b97a0d0 SHA-1: 1589bf158e3cb39255efbd8673a1432354d2ed93 SHA-256: 3f139bd381b48999936b7b8be28ea5569ba51c06ce4ca09af1880beaca775843
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

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://zajinet.ru/wix?keyword=the+ant+and+the+grasshopper+worksheet+answers PDF link annotation
    • https://rezikixudagip.weebly.com/uploads/1/3/4/7/134746502/fizoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452373/normal_5fe16ca598529.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366311/normal_5ff6567fa6f6a.pdfIn PDF document text
    • https://cdn.sqhk.co/vijamabaf/eigVKid/hot_wheels_id_track_portal.pdfIn PDF document text
    • https://teraxumafelenug.weebly.com/uploads/1/3/4/7/134747654/3587722.pdfIn PDF document text
    • https://cdn.sqhk.co/tobipamu/5CcCKKp/trust_crypto_wallet_app_download.pdfIn PDF document text
    • https://tezefidusipenu.weebly.com/uploads/1/3/1/8/131857758/4806416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425926/normal_603879c7491b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448718/normal_60209e5204c4d.pdfIn PDF document text
    • https://pidujalibogi.weebly.com/uploads/1/3/1/3/131380128/50b20398f72f11.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/VCiguia/jurusidegaverawobe.pdfIn PDF document text
    • https://zunudomulu.weebly.com/uploads/1/3/4/6/134604261/01afc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_9718085bdd8c4092a4148a3f23aef400.pdf?index=trueIn PDF document text
    • http://vuxekote.rf.gd/herbalism_training_guide_wow.pdfIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_2ec2e6b88a714e6bafffc95c57e3e9a6.pdf?index=trueIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_7114ed656f014052b2a623b5fa4e1987.pdf?index=trueIn PDF document text
    • https://c7c6162e-a986-45e7-9b02-228acb36ab76.filesusr.com/ugd/6c313a_b165f87dab6c45e3b3e496378a9d843f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/cqc_report_ferns_nursing_home.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/6545229182.pdfIn PDF document text
    • http://tuvatopuvonu.epizy.com/bootstrap_responsive_form_template_w3schools.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/anabond_666_data_sheet.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_off0000cd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD18 5292 bytes
SHA-256: 0f1785b55a94b871491facc7e4c545f23d9e57fee0a87ef9a57a1798ba716fad
font_01_sfnt_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 9980 bytes
SHA-256: deb059f468957dcb72feea778262153bcc157162a30d986c5daf4181f176e3a4

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