Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ce8a6912a1dc4c…

MALICIOUS

PDF

77.3 KB Created: 2021-03-22 05:08:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c3873b49d45da01cd47863503dbf6ffc SHA-1: cdffbfb3046b5a016469417f6709c1b9ab6ba418 SHA-256: 53ce8a6912a1dc4c65be2e47f52b553ef77abbfcccbc15f06e07d76dcfc774d6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/123?utm_term=toxic+wap+music+videos PDF link annotation
    • https://natozimokuwepef.weebly.com/uploads/1/3/4/3/134398015/xojaw.pdfIn PDF document text
    • https://bobovisosusare.weebly.com/uploads/1/3/5/3/135394734/vemegizezor_nududuseza_vexiruwakupep_wuvepogitit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451369/normal_60503f30ce7c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_60372966dfca2.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/ripelaburiza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422145/normal_5febb9e241640.pdfIn PDF document text
    • https://wopedibim.weebly.com/uploads/1/3/4/5/134585971/d2535b2339938.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411922/normal_5fe1873fd6e59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_605622f72764a.pdfIn PDF document text
    • https://dixufewopirar.weebly.com/uploads/1/3/0/7/130775961/8127223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489848/normal_603bded619a66.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/c2feb2b9-a588-4454-92c5-a8668b5130ee/17276520094.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_060c1881653947a490b78024c28729ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88240c74-ba46-412b-a32e-eb8b91fe8224/creative_writing_topics_for_grade_2.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/buy_adobe_acrobat_pro_dc_online.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_d46c86f6377d492aa98b367479ec0c62.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nowokil/47417603087.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_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 5260 bytes
SHA-256: 809798f23782c97f6001b0b7c653197aef2a5f46bf4ad449471dec033e9e90d2
font_01_sfnt_off00010379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10379 11076 bytes
SHA-256: 1196056a84c85885bcbc989f168e5b1797b8bbae5b3174a103e2bfa1f1503ff8

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