Malicious PDF — malware analysis report

Static analysis result for SHA-256 328ad8fb1ec6dcef…

MALICIOUS

PDF

77.7 KB Created: 2021-04-15 23:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9090c3f8ef6c7556245e4ff42cea409c SHA-1: 21d341c036298f25b937b28b97eb7f08c1249d35 SHA-256: 328ad8fb1ec6dceff208131abff51ddda6ee2b708fd49d4b9843197a37819e5b
186 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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://maypoin.ru/strik?utm_term=who+manufactures+amana+ranges PDF link annotation
    • http://zebozewazogaso.scienceontheweb.net/common_core_state_standards.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jojanotesejivi.epizy.com/happy_birthday_cake_with_name_gif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/542d0748-bf27-4b91-be71-8546b43ebe2d/are_we_alone_in_the_universe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c5f50b6-a646-497d-bbaa-531d584f55af/dragon_ball_manga_sales_japan.pdfIn PDF document text
    • http://mozutulobiris.onlinewebshop.net/middlesex_jeffrey_eugenides.pdfIn PDF document text
    • https://c534e673-b245-4a6d-8787-855fe96db707.filesusr.com/ugd/e19215_91607a4c8e334572bc2e280ccbaf793e.pdf?index=trueIn PDF document text
    • https://f5d5bca3-0ffd-41e3-a77d-3d805a1e43e5.filesusr.com/ugd/4e23ca_83352826f06a4460a656f81a7664b3d6.pdf?index=trueIn PDF document text
    • http://bakakixutuv.myartsonline.com/language_assessment_and_evaluation.pdfIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_f5ab8131a0d64b0899a0620d6876942c.pdf?index=trueIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_90727904a556421a8cfdc9f1e2ae7b15.pdf?index=trueIn PDF document text
    • http://pewukexi.epizy.com/jonazota.pdfIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_f30e162ef0dd413595e828de3bfc7006.pdf?index=trueIn PDF document text
    • https://90138cf2-752b-46b9-a396-1872e0473e42.filesusr.com/ugd/02203e_b2f346b8f5af40d2ba1c7f23192b39cc.pdf?index=trueIn PDF document text
    • http://xutenujute.myartsonline.com/zezedebeb.pdfIn PDF document text
    • https://9329dc78-1a6b-4cc7-98ac-1b36262b7dd5.filesusr.com/ugd/d2be55_9077a6624d7944429af073220b025a6d.pdf?index=trueIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_e120a2b524fc45c18dbbe0d3fed626ba.pdf?index=trueIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_3fdb9a5f49ca4ad189be1690e4519d54.pdf?index=trueIn PDF document text
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_ba2d9e795d994c21a034fda07108d4ed.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_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 5276 bytes
SHA-256: d25719bf11048599343a3d1eba54b167a596d36f52cb2e8a5cd1dcbe35606a25
font_01_sfnt_off00010181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10181 11460 bytes
SHA-256: ca0cc902bfb0df8719e2fb188c2af6a72045dde8e08046bbb26543ae05dd2230