Malicious PDF — malware analysis report

Static analysis result for SHA-256 0833a3ae728b3378…

MALICIOUS

PDF

100.7 KB Created: 2021-03-18 11:16:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2e0ad0b776bc81915c03ac73662c85be SHA-1: 29448ec90b9c24ad38d244f03f193a9208857ef3 SHA-256: 0833a3ae728b33784df640e994f9fe944614a856390f0f75ff85bcc6852a5d69
226 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics flagging it as a link farm and suspicious lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://vilenefex.ru/strik?utm_term=samuel+beckett+quotes+waiting+for+godot PDF link annotation
    • http://help-feedback-amzn6.xyz/which_dyson_cordless_is_the_most_powerfuludowv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496391/normal_5fd97130b3925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380681/normal_60382480d299e.pdfIn PDF document text
    • http://com-login8.xyz/88234320843k8rkx.pdfIn PDF document text
    • http://creditscorecard.info/dejesajemawa5qa0m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448347/normal_604690a54e629.pdfIn PDF document text
    • http://supernefritroller.xyz/neumonia_intersticial_en_adultosreph2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_775b3c08337b4e5ebff25ba33403ac1f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d2c9df-e937-4b15-a57e-3f83b4b467b1/if_this_is_a_man_google_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a606a38-c32d-4b91-a16e-570fd3dcf5d4/22990685893.pdfIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_e666a98151bb416d9c864aaa013b7505.pdf?index=trueIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_2afc452f525e450183b05985779c1250.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff762aae-24e9-462a-88c8-b7e769e7af7f/pasar_de_micro_gramos_a_miligramos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0f924b1-8403-451d-affa-402fecda6a47/lazenezilimobisasuf.pdfIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_7919b4ab5e564f4fab02f78fdd0a894a.pdf?index=trueIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_ea2b25dc20bb46e9a2ae302fb27320f1.pdf?index=trueIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_fa1fea834dfa4fca8e8bbf99305026db.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 6076 bytes
SHA-256: 142518bafc0fb787362fd23d9c232a078df21387639f75a06e07ed51dacf4813
font_01_sfnt_off0001321c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321C 5864 bytes
SHA-256: 36fc168eb0058b4df6aa6f50a20c9a4c60c9b47521e944b98d254812de7a4caf
font_02_sfnt_off00014608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14608 13304 bytes
SHA-256: 19c38444fe58be6c985eff783d369bbc67661031abb0ec4573a22703a1eecc44
font_03_sfnt_off00016f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F6A 16132 bytes
SHA-256: 6c511cd2548aab1566dad8f54fccf2be4cd056cf5a4d5d56937977fde9165995

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