Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7395830cab983c…

MALICIOUS

PDF

78.6 KB Created: 2021-06-02 22:38:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4426b030ecbd0e38d97dbf5138332bb6 SHA-1: c9efaa2d17d55609787dcf65965002c14f6626b6 SHA-256: 6b7395830cab983ccd0e4b3bde4a814d4012b3344b25dae61cd57df7d0485a67
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to various domains, many of which are hosted on disposable platforms. The primary function appears to be redirecting users to other PDF documents, potentially for SEO manipulation or to serve as a distribution vector for further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/pbw?utm_term=veda+sabda+ratnakaram+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486563/normal_5fe7fe1258705.pdfIn PDF document text
    • https://salubekera.weebly.com/uploads/1/3/2/7/132740515/kutezudarol-befukug-kugovekobasawir-neliwesomibud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379049/normal_5fcb42433ea36.pdfIn PDF document text
    • https://ridejotewofo.weebly.com/uploads/1/3/5/3/135314456/ae17227a7e.pdfIn PDF document text
    • https://wojawafelufofux.weebly.com/uploads/1/3/0/8/130813934/6490503.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/9050754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_6015c15c91714.pdfIn PDF document text
    • https://jexadafiveti.weebly.com/uploads/1/3/4/7/134765621/d2e3da3.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/6406233.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386349/normal_5fc916f372ca5.pdfIn PDF document text
    • https://dilukali.weebly.com/uploads/1/3/4/5/134584555/lexafudigofaxorutis.pdfIn PDF document text
    • https://wobozosexeje.weebly.com/uploads/1/3/0/8/130814788/sibozaro-bivuses-rejeriwomev.pdfIn PDF document text
    • https://towodoruzaxigol.weebly.com/uploads/1/3/6/0/136050186/tagusos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495525/normal_605b8db3629bd.pdfIn PDF document text
    • https://vufemare.weebly.com/uploads/1/3/4/8/134855896/bodunutaluludumif.pdfIn PDF document text
    • https://gorasamigizutod.weebly.com/uploads/1/3/4/6/134600185/f0514eac1c.pdfIn PDF document text
    • https://pirivelel.weebly.com/uploads/1/3/4/5/134505874/wivodifanug-xunidizot-kuzamogusitav-refuti.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
    • https://uploads.strikinglycdn.com/files/ad2d5503-095e-4429-aa46-a9297439f788/98716781849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41af914-ed5d-4985-b92f-40f3577dc187/83528497326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7babde6d-7932-44ed-bbde-daea288160cc/what_is_the_coldest_city_in_the_us.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6515263-bf91-49a3-8b65-8f0010c3579a/kagekid.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 4952 bytes
SHA-256: a35e79f9231981c0d4589888ad420409931217cecbaf737507d071915e718e0d
font_01_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 10976 bytes
SHA-256: 73a04e9d4bba8e6023efbcaa2ca7659e7233505e54868b146f797b80f81f5798
font_02_sfnt_off00011ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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