Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7a2a0215da3e42…

MALICIOUS

PDF

77.9 KB Created: 2021-03-31 02:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cfe8a310782fcf5cea848db31b1adf31 SHA-1: bd7af5ab2bc56e939dffd9aa1130557ca984f713 SHA-256: ed7a2a0215da3e425c0ed8495ea73f71c36f844a4651b0d186060b1c31bdc64e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 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://nipisod.ru/strik?utm_term=how+to+get+into+gerudo+town+ocarina+of+time PDF link annotation
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/lewakesam.pdfIn PDF document text
    • https://vodazifuja.weebly.com/uploads/1/3/4/2/134265633/eabf604d383eddd.pdfIn PDF document text
    • http://matemepujibad.scienceontheweb.net/best_c_programming_books_for_beginners.pdfIn PDF document text
    • http://demask.space/finevobinetrjj43.pdfIn PDF document text
    • http://barashik.space/gy-_30_bh1750fvi_datasheetnj9f8.pdfIn PDF document text
    • https://labafapagitef.weebly.com/uploads/1/3/1/6/131637364/xazadagi_kusix_wanitila.pdfIn PDF document text
    • http://priz24.site/381622714198hhgf.pdfIn PDF document text
    • http://skidki-day.shop/how_to_bend_offsets_in_cable_trayukk4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_d2c2f3af1cd245838c19c2d93f5c614a.pdf?index=trueIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_9dbb0e62e82b4a8bb8e9929edba2d1f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/739669a2-7d14-4931-bae2-8afad405b37f/the_raven_by_edgar_allan_poe_setting.pdfIn PDF document text
    • http://zedofaxuboz.onlinewebshop.net/82301299704.pdfIn PDF document text
    • http://nevafofuvabovid.atwebpages.com/afmg_notes_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0dc07f-3ac8-4480-91c3-8296bda7dfe3/active_and_passive_voice_practice_worksheets_with_answers.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_ee709733f5794c00b9ea89596d7ff4f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de45675a-c833-4491-b511-f305ac2b8fd6/is_dragon_ball_super_based_on_manga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/461f323a-4dec-48d9-bfee-dd24343c7c09/dumerelixesa.pdfIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_f506a557b1ce4798b32a71906f27efa4.pdf?index=trueIn PDF document text
    • http://lajovaputap.myartsonline.com/irrigation_drainage_systems_engineering.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_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 5184 bytes
SHA-256: ad45e0486e761a97d5225aae3b18c5dab209e6df4d31ab0accf3ee571cc69845
font_01_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 10588 bytes
SHA-256: 9af1b81d6897a75c9fc5a9b7515b99a5cc0af9b525712676d8a6300d9d9f6725

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