Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee54ae8310280493…

MALICIOUS

PDF

73.0 KB Created: 2021-03-28 06:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 38c7fc4ad34acab5628dbea795c221e8 SHA-1: 15235eb7b339d7423d0e878a9f81fc5b561e6bfc SHA-256: ee54ae8310280493c76a5af0a236976911cfe850203b3496a203aede0707e514
206 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with a critical heuristic identifying it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to serve as a distribution point for other malware. While no scripts were directly extracted, the nature of the link farm suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/123?utm_term=best+camera+apps+apk PDF link annotation
    • http://rmk4sale.xyz/282669143739r4t7.pdfIn PDF document text
    • http://futup.ru/little_horse_running_fastnzx3b.pdfIn PDF document text
    • https://cdn.sqhk.co/kesusevuzep/jegeMij/t-_mobile_familymode_home_base_review.pdfIn PDF document text
    • http://xamojopilupivo.scienceontheweb.net/2197206884.pdfIn PDF document text
    • https://cdn.sqhk.co/mifopanikil/fhiCGig/real_racing_3_pc_requirements.pdfIn PDF document text
    • http://remoliwagofaju.mywebcommunity.org/panchatantra_short_stories_in_telugu_free_download.pdfIn PDF document text
    • http://zeruxejobimal.mywebcommunity.org/910417859.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bosirizowu.rf.gd/subgingival_calculus_formation.pdfIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_9f27893913c94578b55ecb10dc69d8d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0272ef3-aee9-44a3-9b82-bc14851b2920/what_are_some_similes_in_the_book_wonder.pdfIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_c9fb48a57dda4349870df0f5564a08f2.pdf?index=trueIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_b2695336ef594d2e972db3dccc4d628e.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_3dfb0f387dd14f1cbaf957e6ce1a61f5.pdf?index=trueIn PDF document text
    • http://kubufubudigag.epizy.com/bacteriologia_medica.pdfIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_6a4a04efd9e149a185d8a8367d013240.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f68bb9-0727-4c10-af50-d375353f2b43/guwawaneful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e075621-6480-40dc-9c25-81d0cf571c4a/32718591889.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_off0000e19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 5160 bytes
SHA-256: 6f10d719fdcb087828812992e3ec0f72f8da9cba3ca3cddc190cf05607ef1338
font_01_sfnt_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 10696 bytes
SHA-256: 5360cea249e8f228950ee1ba3c16a6d43abafac71b263269ca3b98ae57193db7

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