Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d56c50ab5f3850…

MALICIOUS

PDF

74.9 KB Created: 2021-03-15 12:19:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7f8cdb4407e51fade0631a424fdeac2c SHA-1: 90d6a4be46b61f7ba3101f6c48dbb17c8a735c64 SHA-256: d8d56c50ab5f3850b0ed759c90d2f3362c4c39d28e2faa2df357c969a9e03de8
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-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://dugedepap.ru/123?utm_term=reporter+young+sklepy PDF link annotation
    • http://kernig.pro/48228384529e9jnl.pdfIn PDF document text
    • http://meetdouche.xyz/information_retrievalz7j16.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/ae8c86e3-7604-4a52-9c57-498eb81e2252/11924926582.pdfIn PDF document text
    • http://fupizud.rf.gd/dosupagasura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3d07e4e-8a4b-4980-a16a-cd2a1dd900c6/nokia_capital_markets_day_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d33f6b9f-fd19-40b0-b0c6-d4ca31e986d0/jovetokaresix.pdfIn PDF document text
    • http://beluguliwiwe.epizy.com/lagu_bertepuk_sebelah_tangan_pupus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b946ed42-4282-494a-bf37-aa7d53cabc25/how_to_prayer_for_future_husband.pdfIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_a2007d07e71f47afbc249d4d1566309c.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_024a9c55e7be4f15bf2703e098b47206.pdf?index=trueIn PDF document text
    • http://puduvasogedima.rf.gd/sefenikexed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b588d7b7-6e4f-46c1-9ba0-b87f007e5cb0/liguwozigopopatab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b713b061-1ee1-432f-a809-f77183efc30d/fervent_prayer_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df042a47-eea3-4fd2-968e-1bcd6752900a/60417767376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb5eae90-8403-42f4-b64a-3361715c7cef/which_is_the_best_dslr_camera_for_a_beginner_photographer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd823f28-5fb9-4522-8ada-fc77b4f77391/zuvivokexog.pdfIn PDF document text
    • http://lidufaz.epizy.com/97735952747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0635535c-909e-47bc-aac1-fee5d3bb88c7/editable_savable_dnd_next_character_sheet.pdfIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_ecb799ca17674c7fbd6c43f0c698fcaf.pdf?index=trueIn 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_off0000e3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C4 4948 bytes
SHA-256: 9c4af9e3f7030c47dec0f7361354b75ae567158ec657c886f24fca2f1ed1cfab
font_01_sfnt_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 12828 bytes
SHA-256: a8e95dbe3480ba062cba7b32c9a9d7ce34639885c1768bb52ba9bb3d331c9dd3

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