Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bf92e4365b2ce6…

MALICIOUS

PDF

91.3 KB Created: 2021-05-05 10:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 92b2b7d06f802bc35f125b4a7af4a7d6 SHA-1: dc0e333452545690992fbaa1d5b4484d810a7ed1 SHA-256: 57bf92e4365b2ce6f33e492266fc4973f68d09aeaedb4565844d1fc87a065324
186 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, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://ponafet.ru/strik?utm_term=how+to+program+craftsman+garage+door+transmitter PDF link annotation
    • http://livemavuxedu.getenjoyment.net/bacteriology_lecture_notes.pdfIn PDF document text
    • http://bulubuzigajuzar.getenjoyment.net/43219202992.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/1482999246.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/88267312577.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://673fcb93-492a-40d1-a7cc-77260b5c7816.filesusr.com/ugd/62d21a_3bf285cbea564eabac38e0d510dc0c37.pdf?index=trueIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_24bced33f7f444c2bfea68299b0cde78.pdf?index=trueIn PDF document text
    • http://dijipola.onlinewebshop.net/akin_escala.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_1da72cfe4bca47d99a2253c6a03809af.pdf?index=trueIn PDF document text
    • http://widepidaba.atwebpages.com/file_youth_unemployment_in_namibia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcdb6a8b-2406-4d51-bd86-1eca7c7d16aa/what_is_the_best_music_app_for_iphone_free.pdfIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_33f462d3a5554bf0add15d22b065cc6e.pdf?index=trueIn PDF document text
    • http://tuminexozuvino.atwebpages.com/20516544725.pdfIn PDF document text
    • http://wugetad.myartsonline.com/37797103003.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_251dc977b5dd4021afd4cf0897055e7e.pdf?index=trueIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_47f860a81adb499babc37b7fd585361c.pdf?index=trueIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_4f6ffdf89bbc4d62abb965c0132f7e83.pdf?index=trueIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_9e40a4d450574440a22b08acfea362ea.pdf?index=trueIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_3815734e2da243aebda619b9937d1035.pdf?index=trueIn PDF document text
    • http://wenulusevikofa.myartsonline.com/botaxozijerina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c76446-9733-4800-9451-1fed91c19ddb/gagasaludiwex.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_cc2865235d7647baa9a15eebba1c5c2b.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_fff51123c30548ff8a7df2b360107ee1.pdf?index=trueIn PDF document text
    • https://6ada6c45-9e8d-4063-9633-40b9e375d9b0.filesusr.com/ugd/9a7afa_31800e6d494b46d3b62d426c097b3b34.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_off000125d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 5496 bytes
SHA-256: a275783de8fe0e70ef494677829f8e31008030745d0f9e012d21e5422d9cc0f4
font_01_sfnt_off00013885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13885 11324 bytes
SHA-256: 5c3a53f1dd7bfc603fa5224bd3778e6f849c671c1bb178142396c8c76b6d1416

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