Malicious PDF — malware analysis report

Static analysis result for SHA-256 b781b389a4b937fd…

MALICIOUS

PDF

77.1 KB Created: 2021-02-14 22:24:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e50919f4c8df5c830287afdde7981a4e SHA-1: 138a23ca6c7889e0cb33118358650232d34d1e85 SHA-256: b781b389a4b937fd6849f330bec0bbbd84a98ca6e74f067fb386f41e718fa284
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL points to a keyword-related PDF, indicating a potential phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=cladogram+worksheet+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403684/normal_5fee3ad486079.pdfIn PDF document text
    • https://sadupomojafex.weebly.com/uploads/1/3/0/7/130776775/namolofabadopev.pdfIn PDF document text
    • https://mabavelege.weebly.com/uploads/1/3/0/7/130775551/lukavijemak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444374/normal_5fe90c01e4305.pdfIn PDF document text
    • https://lirisuvobuku.weebly.com/uploads/1/3/5/3/135399047/lupisagid-labojeviserep-rifinajaginez-gideki.pdfIn PDF document text
    • https://kiwakamumosa.weebly.com/uploads/1/3/5/9/135963193/b014cd7569beba4.pdfIn PDF document text
    • https://jefamiwufilidiv.weebly.com/uploads/1/3/1/4/131409158/959334c99b.pdfIn PDF document text
    • https://kipunelikerave.weebly.com/uploads/1/3/0/9/130969086/muxabuxujive_vaderafol_pelejuk.pdfIn PDF document text
    • https://fotunerabo.weebly.com/uploads/1/3/4/0/134042859/3287818.pdfIn PDF document text
    • https://jodajapiguzok.weebly.com/uploads/1/3/2/7/132710756/9693545.pdfIn PDF document text
    • https://mivixotagu.weebly.com/uploads/1/3/1/3/131384173/pamegakazozozuv_gujotoxapux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384468/normal_5fc78d7dd45ef.pdfIn PDF document text
    • http://health-top.ru/inside_reading_2_second_edition6f6fg.pdfIn PDF document text
    • http://znasila.ru/powezedonejskoe.pdfIn PDF document text
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/kasufiwe-potafuze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385038/normal_5fe2d99761236.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/51924714398.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/brazil_visa_application_form_for_pakistani_nationals.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/guvikapises.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/pazonirenol.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/bluetooth_software_for_pc_softonic.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_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 5404 bytes
SHA-256: b81664ab37e423b136a04c6195eb77bbb785e3fbd532409c89d00a1a4ec60c60
font_01_sfnt_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 10804 bytes
SHA-256: 32a99513d5196464997a033d7eeff469117565753a5226865d98458ef50eb975

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