Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32f043f1ee58cc9…

MALICIOUS

PDF

78.1 KB Created: 2021-03-21 02:39:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 04ca70c7bc047bc5a6e895a6b1924459 SHA-1: e76d037e316262fb7a312ad2d7ad623581203608 SHA-256: b32f043f1ee58cc9b76c04e0d06592de881178611077ed17254a309091a30066
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URI suggest it's designed to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://vilenefex.ru/aws?utm_term=how+do+i+reset+my+culligan+water+softener PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374371/normal_602036c89ca04.pdfIn PDF document text
    • http://vinograd.io/telewusuvp0iar.pdfIn PDF document text
    • https://xemageka.weebly.com/uploads/1/3/1/3/131380316/pawonebaruxu-sukavopugofa-zasotigi-xosob.pdfIn PDF document text
    • http://myimperfectmomlife.com/what_opens_dwg_filesanjzw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423780/normal_5fcedf3398e09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370528/normal_5fc613152b411.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/studio_5000_logix_emulate_price.pdfIn PDF document text
    • http://merishwheelrecords.com/mobile_legends_kagura_guidec88s6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449769/normal_600d1378e6740.pdfIn PDF document text
    • http://rufoferapavinew.medianewsonline.com/87598872676.pdfIn PDF document text
    • https://pimalikatirowo.weebly.com/uploads/1/3/4/0/134040386/71327d9322.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c67b4f2-96b2-4014-9379-7916f8811610/new_covid_death_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/720497f8-3557-4e04-9747-1466a4b5d1bf/40839337029.pdfIn PDF document text
    • http://lofunadex.myartsonline.com/probability_questions_and_answers_gcse.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/android_wear_change_alarm_sound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a094643-b832-4d39-b8a7-efd71e818f4f/salvation_army_housing_association_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/autocad_civil_3d_2014_manual.pdfIn PDF document text
    • http://ketabigumowun.atwebpages.com/tokakajozobon.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_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 5496 bytes
SHA-256: 018e77d2e580a85b6f067178b66181265e4c40c2919c6ed3ea0811241272113a
font_01_sfnt_off0001052b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 10532 bytes
SHA-256: 8e048d4add0c063ba73108933abbca2457cfc4bc2b09dd84b3ed688f9abd275f

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