Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddef4e5fb915a5db…

MALICIOUS

PDF

73.7 KB Created: 2021-05-21 10:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 04c2667de847c88b63d29cfb7d296690 SHA-1: e1e55697e91c8102fcf61e9deff23fc1616d7896 SHA-256: ddef4e5fb915a5db8972919d59007c77a811de37ae7eb031224e7ab494f3f70f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=migos+llama+llama+red+pajama+lyrics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445534/normal_6035064b89b82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414486/normal_60501edb5556b.pdfIn PDF document text
    • https://vexusonefopi.weebly.com/uploads/1/3/4/5/134583249/5433238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479705/normal_60461b37a2474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_6010f7e824d09.pdfIn PDF document text
    • https://pijolonaponezu.weebly.com/uploads/1/3/4/8/134879261/dunobupavaxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406514/normal_5feb6805cb205.pdfIn PDF document text
    • https://semuzotefol.weebly.com/uploads/1/3/1/4/131437619/a777bffa2fe8198.pdfIn PDF document text
    • https://ribugasa.weebly.com/uploads/1/3/6/0/136053023/347002.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/e0a65849-c41a-4e0b-957e-4bc36231f3a1/plantronics_c054a_headset_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82514a38-6232-409a-a585-5be595845cb6/new_testament_books_in_order_written.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/diginiget.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1460f308-40e0-4532-adb4-a4bd9fef1a20/notas_de_canciones_para_piano_faciles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5648fda4-b7ef-42cd-aa33-e0fe1f282947/72148498724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5312937d-9d64-4e43-a7c2-ecd2d1c75a54/68362096039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec4a7817-2971-459a-9576-27cddfbb3320/dometic_4_button_thermostat_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/52181842223.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_off0000d380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD380 5176 bytes
SHA-256: aee922af04733be000c5d06a0507edc6fdb655f63ceade4e23e78403f29498d1
font_01_sfnt_off0000e529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 11748 bytes
SHA-256: 6da866119bcf4268f64bf8a17b57a75725ed270cd3c8a8439f11c92aa4367fea
font_02_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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