Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad9b444957583c2…

MALICIOUS

PDF

78.8 KB Created: 2021-02-25 18:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1e10d04f373869740b9032281ff6cd17 SHA-1: a3d6c7d3f48759db2ae9abf742e3870e5334d5d7 SHA-256: 4ad9b444957583c296c52072989d58f665f721e2b2a1429bca2d0197c9c6966c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV heuristic firings strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the extensive link farm and heuristic detections point towards an attack pattern involving the redirection of users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://baarspo.ru/strik?utm_term=summer+baby+gate+instructions PDF link annotation
    • http://canonsburglake.org/brain_out_level_139_answers2qxmk.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/the_curious_writer_brief_5th_edition_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/miahigg/edit_photos_and_videos_on_iphone_add_text.pdfIn PDF document text
    • http://apparentlyopt.com/bopoxoviwetej18q5d.pdfIn PDF document text
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/midobazivuzopipaximo.pdfIn PDF document text
    • https://boxenisudima.weebly.com/uploads/1/3/2/7/132740338/doxixovujazekano.pdfIn PDF document text
    • http://delinapod.mypressonline.com/introduction_to_machine_learning_python_book.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/jjcgf4u/84220101385.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/6338981f30be25.pdfIn PDF document text
    • http://nikaold.site/mount_lanayru_dragon98u9z.pdfIn PDF document text
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/mujilisifulovalo.pdfIn PDF document text
    • https://makurabun.weebly.com/uploads/1/3/4/6/134651698/b5e9e1a14.pdfIn PDF document text
    • http://helpcenter.business/35436262193dwbd8.pdfIn PDF document text
    • http://akmurzina.com/brawl_stars_box_opening_simulator_pcl7p7i.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/Dhgggq6/66779860498.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/dabewejoxojutemebas.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/simujix/cahier_d_exercices_taxi_1_answers.pdfIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/19403119031.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_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 5432 bytes
SHA-256: 6470723f4dfce725ce915ba92fc01b9a201d453f0d93fb79171d908582ba725f
font_01_sfnt_off00010ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 10412 bytes
SHA-256: 73375c2fe7bfbf1a2da2d684b750526171bb776752f95fdc5fadfeb7e30cc177

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