Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb57017996015363…

MALICIOUS

PDF

75.7 KB Created: 2021-03-18 19:05:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6b873ff488dd9dd8828363bfbe76bfa9 SHA-1: 234fe4af225471b35d0e4c7d74a78c00e340e810 SHA-256: cb57017996015363a667648c9d10dd332811e0e5d19e25b9d07aa4d27a609f55
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jottigo.ru/123?utm_term=software+reliability+engineering+musa+pdf PDF link annotation
    • https://fowidejufato.weebly.com/uploads/1/3/4/5/134582967/kulonafo_bibunelejufak.pdfIn PDF document text
    • https://fugazuxelodurip.weebly.com/uploads/1/3/4/6/134639195/kixogamixovegirew.pdfIn PDF document text
    • https://jakugogafezokev.weebly.com/uploads/1/3/1/4/131437362/c93b81f04901.pdfIn PDF document text
    • http://dapajibidamazed.mypressonline.com/bpsc_admit_card.pdfIn PDF document text
    • https://bifulegipemafus.weebly.com/uploads/1/3/5/3/135312859/2703554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495997/normal_601b679d0a707.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/8389475.pdfIn PDF document text
    • http://xeberul.mywebcommunity.org/mudatujowawewemut.pdfIn PDF document text
    • https://famemizi.weebly.com/uploads/1/3/6/0/136006686/d543a47ec666.pdfIn PDF document text
    • https://nizuwutino.weebly.com/uploads/1/3/1/4/131482859/bolafogimemax-mukufi-lukix.pdfIn PDF document text
    • http://veviwumifuvemuz.mypressonline.com/81669886652.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/charles_bukowski_post_office_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455380/normal_5fcdc78c95d84.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_38122846650e4d5fba0925d57f107c0f.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_415e62688f9349cdbe5527962e631d7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/pevoriwofatilezebufulove.pdfIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_0d107696ac434fe1a055bef8a0936c22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nemafu/zunuvefetekifejiremon.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_0be01d4e588b4ce7b74df8f0ff912fa9.pdf?index=trueIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_a306cf06680c42919e9c85a6fadf2bce.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 5800 bytes
SHA-256: aaf36a17a6fcaf41048d1be87314c9a0c62d97aa1ad911970b487fb81ee98f82
font_01_sfnt_off0000fa0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 11984 bytes
SHA-256: 5bafbf65f4a22e3be7d4940dfe17f819fd99aa15eff40f277fcaf3d3c7474721

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