Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0b75b38992bef7…

MALICIOUS

PDF

80.7 KB Created: 2021-04-30 23:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: dbcd9470a845235f6a25bc10cfe76aae SHA-1: 2f3325f18f7db6cac80f3259f26d4cd7ee05da64 SHA-256: 5b0b75b38992bef7708efbbc1008118457e3703617c04bbcb4997f77e0560ba8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/strik?utm_term=define+positive+attitude+meaning+in+hindi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494891/normal_60426d10d739a.pdfIn PDF document text
    • https://modibidusez.weebly.com/uploads/1/3/4/0/134096811/ad67682.pdfIn PDF document text
    • https://lolejubabam.weebly.com/uploads/1/3/1/3/131379737/6445401.pdfIn PDF document text
    • https://lasonitukaxo.weebly.com/uploads/1/3/4/8/134889758/4930976.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415526/normal_5fc9dff61a916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410416/normal_60473db68c1e0.pdfIn PDF document text
    • https://sadoxeliwuduw.weebly.com/uploads/1/3/4/0/134040540/juwej_konesewixesix_vugepifilun_fonilufalekuji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_6019ac08426fc.pdfIn PDF document text
    • https://zobuxojakaxux.weebly.com/uploads/1/3/4/6/134690110/fusafovikumon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445737/normal_60121632728cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445726/normal_6065208fb8b85.pdfIn PDF document text
    • http://fartook.online/86511931488aqs5f.pdfIn PDF document text
    • http://badge-verification-center.com/2005_jeep_grand_cherokee_limited_tire_size5e5w1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484383/normal_6030383ae2f21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413017/normal_60317048aed34.pdfIn PDF document text
    • https://bavanakeburosot.weebly.com/uploads/1/3/5/3/135302165/laketemegivipugidu.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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a7fdbee-35ff-4171-940e-6a4c938bf8bd/abc_of_cbt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cc76d56-f25f-47bd-a70f-ea8adae7ce1b/retafekabepata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba748ccd-8c96-4bfe-b95f-13473e368bd8/nolopate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6c8951-74c1-4555-bf8e-a11aca9bf4c8/7553411394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef765a12-eb81-4de4-b7fc-274d38fcdcbc/small_tree_of_life_tattoo_with_birds.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 5268 bytes
SHA-256: f6f93013c280e2e510411f57147fae30475819770d19b744cea359d8c13e4591
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 11184 bytes
SHA-256: 3407324de816bea6f81909ce37fd5f797baef132c1285767fdca3ad42906038f
font_02_sfnt_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
font_03_sfnt_off000127c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C0 3200 bytes
SHA-256: 3023d8e8a4e831f2dfc47ebe8f77e485b1dfb3a0322e86665d5e24ef7e5bc20b

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