Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb67b672a2dd3508…

MALICIOUS

PDF

120.2 KB Created: 2021-03-06 16:39:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0648f0bc6be892d61343b72a35823d23 SHA-1: b1446b94d60cccafbe368559f5c18698a956c4f3 SHA-256: cb67b672a2dd35086709100a9cef8f5ab5d7f0e7f5bed79aa9c51158a9a59888
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links, with one prominent URL pointing to 'mezovuduw.ru'. This suggests the document is designed to lure users to potentially malicious sites, likely for phishing or to download further malware. The presence of multiple external links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=death+note+book+1 PDF link annotation
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/1057130.pdfIn PDF document text
    • https://pojuzalik.weebly.com/uploads/1/3/4/2/134235388/5839494.pdfIn PDF document text
    • http://vozuzutiwajuzip.getenjoyment.net/zagg_keyboard_ipad_air_10.5.pdfIn PDF document text
    • https://tutonaxubetu.weebly.com/uploads/1/3/5/2/135296536/xinotamunotuwexej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448115/normal_60371479bd277.pdfIn PDF document text
    • https://wekosidofanepa.weebly.com/uploads/1/3/2/6/132696212/xajaxekididowolomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404976/normal_5fdc6cc9610fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_603f1e34aade9.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/97428ac33ab07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528876/normal_603fc43d7a6db.pdfIn PDF document text
    • http://vedivux.mygamesonline.org/11490296672.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/reludademaxutomat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_ee3ae8c440b44eeab787a504d7e0471e.pdf?index=trueIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_4d5b324d52a347ba9eedc966740ab6c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/latest_movies_bollywood_hd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/kuxiselugifefogudukuj.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/17418172251.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/the_freedmen_s_bureau_bill_worksheet_answers.pdfIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_ca77be659d9644a1b67d7525fdbf9d3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/julaxel/28070769421.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_c0c4478b9f904e89ad802cfbcc5cb26a.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_eff3873a23264bd9af07ebba20c3608f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000114f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x114F4 45724 bytes
SHA-256: a863ca821fdc198204b6bce0d8ab70082198e432220848bdf734ae966c168790
font_01_sfnt_off00019c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C2A 4720 bytes
SHA-256: 83bcd27dc97efecaad4eee9af695c0b1966ada7dd2e221514242fc42ccf38cf4
font_02_sfnt_off0001ac41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC41 11268 bytes
SHA-256: b673dc90868ac0db3c99aec151a32c41f9fa957084f9b39397c52bda2c681e3a