Malicious PDF — malware analysis report

Static analysis result for SHA-256 356d166134ea7b5b…

MALICIOUS

PDF

76.0 KB Created: 2021-03-25 03:43:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 064bbed592714db038b57b96bbd85f17 SHA-1: d1a78007aa8d69e24fb3333135c357cd33ebf16a SHA-256: 356d166134ea7b5b952e9064f19b85e2f836f06533dfb6d0842c5c8bc98bfd20
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF's structure and embedded URLs align with techniques used for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jumiwimov.ru/aws?utm_term=please+understand+me+test+pdf PDF link annotation
    • http://zitokujamu.mypressonline.com/nasejele.pdfIn PDF document text
    • http://creditactive.info/tewexozewawilodobwqgy.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/59586281081.pdfIn PDF document text
    • http://jerimujolegem.medianewsonline.com/23532234035.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/7858395243z766l.pdfIn PDF document text
    • http://mofemaruwek.sportsontheweb.net/gosinevumaganara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_604181259936f.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/54481177515.pdfIn PDF document text
    • http://mizifasurogik.mywebcommunity.org/what_do_the_battery_tender_lights_mean.pdfIn PDF document text
    • http://pegodetopado.iblogger.org/perokavo.pdfIn PDF document text
    • http://indital.fun/35820256699fnc7k.pdfIn PDF document text
    • http://uablog.website/safejncfgo.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/jands_vista_s3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387918/normal_60074c955e73a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407991/normal_6050e7e8baf8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fufabufitilaf.epizy.com/43845080925.pdfIn PDF document text
    • http://nedanitajaw.epizy.com/singer_model_4423_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/kawetetoteniluz.pdfIn PDF document text
    • http://kesitebogi.epizy.com/76880148920.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/9426675543.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_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 5188 bytes
SHA-256: 673df391484310782654bb0438271857fd5f59822e5fb86d037e233e482b1b90
font_01_sfnt_off0000fddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDB 11012 bytes
SHA-256: 4252e988d5e7b5f1891ee3f63c3dac651464e07b98c4fa03dcea5a5bd1ebfb62

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