Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1251306ca225466…

MALICIOUS

PDF

66.5 KB Created: 2021-03-11 22:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9962d555c99c9f97035bde9c16f8c67a SHA-1: 00be0e22cd2d7fd2ade6a95dbbd3fb431c8d288a SHA-256: d1251306ca22546654a8b586780e763690c4affb1f96d1b644d3371381923885
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/123?utm_term=storleksguide+handskar+herr PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444850/normal_5ff4eab51706a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469355/normal_60022569bdc6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495269/normal_5ff4396e5d5c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490265/normal_601553da14b75.pdfIn PDF document text
    • https://jinozeposejide.weebly.com/uploads/1/3/1/4/131453810/1787177.pdfIn PDF document text
    • https://jedagafigi.weebly.com/uploads/1/3/1/4/131438055/rijikuvovifu.pdfIn PDF document text
    • https://tisogile.weebly.com/uploads/1/3/4/7/134728595/3f8ed7f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_5fdc40b5d8a13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475725/normal_60171656da2c2.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/xisefowu/zovususapoxuroxufipelow.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/tokiz.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/77326907577.pdfIn PDF document text
    • http://gikojutubosolu.epizy.com/90753124696.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/whatsapp_messenger_latest_version.pdfIn PDF document text
    • http://miwefonozez.epizy.com/us_embassy_visa_application_form_barbados.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/90202150360.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/genero_lirico_subgeneros.pdfIn PDF document text
    • http://mipuberepe.epizy.com/by_the_seaside_ringtone.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_off0000c947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC947 5256 bytes
SHA-256: 6cb42de4cf95d048f333d8050cde62be30def2338478186c05c914bd68017cf4
font_01_sfnt_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 9812 bytes
SHA-256: 7789eb4e97ab691202b3769659789ec6e202982b70d52829711b65d1dd114d7b

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