Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bcb6d91b463eb0…

MALICIOUS

PDF

75.7 KB Created: 2021-04-15 16:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4e8a8c0fa12f5a3cfa306a4138f93f7c SHA-1: 2160f27bfe7d2474e7e20adf43d12fc3ce64b325 SHA-256: 61bcb6d91b463eb0ec7408a11e7e6ad40c6e8c87000f1cdd80b8031b6d48e95d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal it contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URL `https://nipisod.ru/strik?utm_term=the+critic+cartoon+jurassic+park` is particularly suspicious and likely leads to a malicious site. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

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 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.
  • 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://nipisod.ru/strik?utm_term=the+critic+cartoon+jurassic+park PDF link annotation
    • http://paruweropu.iblogger.org/hyderabad_weather_report.pdfIn PDF document text
    • https://disipewadapa.weebly.com/uploads/1/3/4/8/134870645/2ad7906bd8b1.pdfIn PDF document text
    • https://sudopefizumizer.weebly.com/uploads/1/3/1/3/131383323/zemoxudusuze.pdfIn PDF document text
    • https://litezami.weebly.com/uploads/1/3/4/5/134514091/18bac4784.pdfIn PDF document text
    • http://vorusobowa.66ghz.com/23257461295.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/fajeloninesitel/honda_maintenance_code_b_127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d129cb7-a02b-4907-9549-a85b5afc93ad/87030870064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cd954aa-a933-4f5c-bbc5-390fed48dc75/57484984994.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/1_2_inch_binder_label_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/isac_chuseok_2019_eng_sub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad2a98bc-7092-4a1e-a85c-43cdf9d9a07a/why_is_my_hp_laptop_saying_preparing_automatic_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/82232654825.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/merchant_of_venice_theme_of_mercy_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/bgi_ethiopia_company_profile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bdedfde-d471-4a0f-b87e-e5c2533516b6/plantronics_s12_compatibility_slide_switch.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/mapevetozuzowafoba.pdfIn PDF document text
    • http://jupilabezisetif.epizy.com/wagitisatefojasulil.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/how_do_you_crochet_a_granny_square_blanket_in_one_color.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57f15fd-b66e-44d7-b3e6-8efe0e1be2ee/did_odin_kill_lokis_father.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/milaxotegiwadimewuj.pdfIn PDF document text
    • http://nenutufap.epizy.com/animated_arrow_gif_image_free.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_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 5080 bytes
SHA-256: 9298d4df443a36dc4a6b337a6fbbf7cb389bb405168636eba84d386af0d8eece
font_01_sfnt_off0000fdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD5 10512 bytes
SHA-256: 09675be0a42b6839c315ef46d3188311bccc9ec682af42db65a21fb4d89bd3c0

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