Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1aa61a9115225e…

MALICIOUS

PDF

76.8 KB Created: 2021-04-25 19:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1c3c4096da334354f9e0906bc35d0f1e SHA-1: 55a095f0a3e1de39595a61a54899def37aa62cbe SHA-256: 6d1aa61a9115225eb302f62eea95a2151f68c4f221141bf63642f4abdf3dd845
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 0.9995

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/strik?utm_term=how+to+become+an+aircraft+mechanic+in+canada PDF link annotation
    • https://jelimofinumalo.weebly.com/uploads/1/3/4/6/134669039/4413032.pdfIn PDF document text
    • http://help-bluebadgecenter.com/75096390684bi978.pdfIn PDF document text
    • https://niwifexugebap.weebly.com/uploads/1/3/5/3/135316215/0758bf49f1801.pdfIn PDF document text
    • http://afracheat5.xyz/wijaxatagibepotiriwipobkini.pdfIn PDF document text
    • https://rorupuloloxotog.weebly.com/uploads/1/3/1/4/131409755/bepapenosuvanig.pdfIn PDF document text
    • http://usmileofficial.site/pexodisokpoltp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481828/normal_60551d70e9df6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480884/normal_603d954acb0db.pdfIn PDF document text
    • https://tupuzozen.weebly.com/uploads/1/3/4/4/134403730/fevubepufiwirab_rotubeb_xodedepeluloru_jajeximeputepa.pdfIn PDF document text
    • http://cybety.xyz/68052167939r2d1s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415964/normal_604a760cee8ed.pdfIn PDF document text
    • https://fowidejufato.weebly.com/uploads/1/3/4/5/134582967/fivobuluvabubuvuse.pdfIn PDF document text
    • https://lukavorewigi.weebly.com/uploads/1/3/4/8/134862497/gotusiporisatix-gopidabafusiw.pdfIn PDF document text
    • https://jajelawipazug.weebly.com/uploads/1/3/0/7/130739535/lemeguvipu.pdfIn PDF document text
    • http://gouliwer.online/bengali_baul_gaan_free1rlff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_6043932eb0b47.pdfIn PDF document text
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/leputabo_vosazovisiwesa_fofawin.pdfIn PDF document text
    • https://mopebewugo.weebly.com/uploads/1/3/0/7/130776026/jopimono-rekig.pdfIn PDF document text
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/pubajekozogemet-pabobimenunupuj.pdfIn PDF document text
    • https://gerudupox.weebly.com/uploads/1/3/2/7/132712596/mewupozudu.pdfIn PDF document text
    • https://labatozun.weebly.com/uploads/1/3/1/6/131607827/9239894.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373240/normal_5fde27b587426.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 5244 bytes
SHA-256: 09fb4753db73effa11c0301da493666ef40f568960421996aee77a0b6dc3d0ad
font_01_sfnt_off0000ff73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 11060 bytes
SHA-256: e89e99ee5589fe2d9bd2cbb7d5ea2c53ac3d66ccdf878b5944f2c0d730acb995

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