Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f9a7a2a7090c04…

MALICIOUS

PDF

74.9 KB Created: 2021-06-11 04:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3cca9b7a30a8954b01e2f65109ad7c65 SHA-1: caf1c947364bad25090b6deb4001eda11a302518 SHA-256: 69f9a7a2a7090c04be4a8c5aa7caf97be32ca59d9a5ebc0d14e7a6670d13fa20
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pistant.ru/pbw?utm_term=gleichungen+aufl%25C3%25B6sen+aufgaben+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416331/normal_6035724fe1282.pdfIn PDF document text
    • https://fuloronarenor.weebly.com/uploads/1/3/4/8/134880411/ligonud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495037/normal_603e0d6f454f3.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/793725.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425916/normal_5fcbf00a16641.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4410416/normal_60b2e3b77295e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480142/normal_605a96a88f188.pdfIn PDF document text
    • https://zematewisa.weebly.com/uploads/1/3/4/8/134897668/9849916.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d224834-37fd-4bd6-b150-42b852a8556d/71662836071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8503c5d9-c1b5-4118-b71f-7b9f87c9bc2e/quiero_escuchar_el_rosario_dela_divina_misericordia_cantado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2611249-853a-40de-b96e-9b386ccc7f59/vawulewukukivakegowuk.pdfIn PDF document text
    • http://movovepavuzi.pbworks.com/w/file/fetch/145089414/sp2_supervisor_final_exam.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/the_time_travelers_wife.pdfIn PDF document text
    • http://kibumezi.pbworks.com/w/file/fetch/144468162/88992239635.pdfIn PDF document text
    • http://tukosifana.pbworks.com/f/free_fire_indonesia_server_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad2281d-b208-42f5-904e-bd5dd0316c75/direct_rule_and_indirect_rule_in_african_colonies.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144524199/linea_de_damoiseau_que_es.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 5628 bytes
SHA-256: 8cd49c35644ed8c7e51ed0472c3d4d69c11c1828a0036b5d327cc4631bd18e2e
font_01_sfnt_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 11332 bytes
SHA-256: ff20341a7ccf59d9051d80a48c7cf4d5cee1a872df62abc47afc66c474199f1f

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