Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aae05d527ab3c2c…

MALICIOUS

PDF

81.3 KB Created: 2021-04-03 23:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f8b295a4cd08bb65fc21a67d0c9ccc8a SHA-1: 9fb8a7a0cf1b588cbb83d439db3b7a2ab85fc2ec SHA-256: 4aae05d527ab3c2ca2b35eb43fbd804e17c8b6d024efe5186291c279dff26af4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://lozipotod.ru/award?keyword=useful+english+phrases+for+travelling+pdf PDF link annotation
    • https://cdn.sqhk.co/gopilufifeda/ITgcvjd/angry_birds_cast_2.pdfIn PDF document text
    • https://cdn.sqhk.co/kamavedes/ifAFHje/98307891293.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/jengjib/vuzirugomifa.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/zevoboxiguxedejokabej.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://wunuxuvi.sportsontheweb.net/lonely_planet_egypt_free_download.pdfIn PDF document text
    • http://zeropium.com/how_to_start_a_youtube_channel_in_teluguzvste.pdfIn PDF document text
    • http://velesvoyage.ru/folemavivuzosurof2vjs3.pdfIn PDF document text
    • http://xanejog.medianewsonline.com/list_of_companies_in_tamilnadu.pdfIn PDF document text
    • http://vovpomnim.ru/sulumikiwutixanyrk5.pdfIn PDF document text
    • https://cdn.sqhk.co/gifexajed/fl8CUhh/5962788359.pdfIn PDF document text
    • http://alex-chekalev.com/lorevudarisamuruwigawisej8ezej.pdfIn PDF document text
    • http://insurancecarusa.com/apkpure_video_er6l12u.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/800bd255-8fa4-4907-88d7-436e90f80a5d/43849641851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0297a95d-57eb-4945-b91a-bd0fd723bef4/66673410996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d044ff5b-bfc8-49d2-901c-71462fd53071/nipelizukimanisikekitidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7879943-384b-4ca0-bda7-4fa863ee473e/management_information_systems_salary_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f91c0a7-43f3-4640-b8e1-2a80890b3dcf/40006717149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4850cb4d-2721-41f8-b521-78475cf6923b/79084590357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c76234-200e-49cb-b9a3-cf8b22a48dad/365_photo_project_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6fd24c0-8f6b-4050-bf29-ebf39365d441/air_fryer_recipes_for_beginners_pork_chops.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_off000100a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A3 5356 bytes
SHA-256: 058658ec8ad7c794668595e526926b7200036cd10d89e14fee4fc9a7747d589c
font_01_sfnt_off000112dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 10320 bytes
SHA-256: fe6f0b111669bf7990f5cedfa815760c7a561bf1de859125a9466ff8f47e662d

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