Malicious PDF — malware analysis report

Static analysis result for SHA-256 daaac69697a241a6…

MALICIOUS

PDF

85.9 KB Created: 2021-05-28 12:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cf76da7cf6ea859374e16ef3b594acf7 SHA-1: 6cbf52e472197ccbbc7f5b0c93156a17b472ff43 SHA-256: daaac69697a241a64f82fcc8938763fb0776840a2149d2f0698cc6e01c6fbabb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The primary URL, 'https://ponafet.ru/strik?utm_term=14.3+mechanical+advantage+and+efficiency+worksheet+answers', suggests a lure related to academic content to entice users to click. While no scripts were explicitly extracted, the PDF structure and link farm indicate malicious intent, likely to redirect users to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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=14.3+mechanical+advantage+and+efficiency+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452835/normal_606e376dd85ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479904/normal_5ff30de1a2d6d.pdfIn PDF document text
    • https://zuborezebakit.weebly.com/uploads/1/3/4/6/134638686/jakusebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459776/normal_5ff48fd56836e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_602c693ba6b2c.pdfIn PDF document text
    • https://jakigirizog.weebly.com/uploads/1/3/1/4/131453624/gagomawubagi-kokopijoxiv-finenuxogil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_600c23a719486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_60259b0121a76.pdfIn PDF document text
    • https://toxozuduz.weebly.com/uploads/1/3/5/2/135295771/92e28fe09983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426675/normal_601e138137d16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461744/normal_604d9fed26ca1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486984/normal_6006d50acb79f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421615/normal_6009ab195a7bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a7bce1b5-c338-48cb-a632-cfba3cd79603/vefovozemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a3c97e-06c1-44f7-9fe4-5694dd6fb48d/78347743951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba626de-0c73-4424-bfd3-d159bc4475d4/el_dador_de_recuerdos_resumen_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5da5a81c-5497-4315-a530-4d59d9692c14/what_channel_is_fox_news_now_on_directv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a7ad299-efb6-47ca-92cc-ef37a62164d2/how_much_money_is_bobbi_brown_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f34e110-3109-45a7-98f8-5a333ff5f40f/how_to_learn_to_speak_english_everyday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2118509b-d30a-4dc7-9c36-4950627bf1c0/15730884388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab051f4e-cba5-446b-a4b9-eb50452efa07/26893297013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f5ef3f-7cc6-4568-882c-50ffa049c584/27322854782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5791c9de-1958-4f28-a09c-9bf208a15fd8/what_is_the_meaning_of_effective_provisional_admission.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 5780 bytes
SHA-256: 1dc3d68815c0efa9b99cf9c4f7e0835c33a88b5cb6ec7c9bab060a1147d10102
font_01_sfnt_off00011686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11686 10764 bytes
SHA-256: b48991f88c497900dccbff1a3dfc04f3dc078ad40b980e72d3b2f877100f0158
font_02_sfnt_off00013b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B47 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230