Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f28cdc3dd7f24c…

MALICIOUS

PDF

71.3 KB Created: 2020-12-16 15:51:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 11c7d226a31ac929c4d3cf5a8ff67223 SHA-1: 9657e0e2fffe9b3d7dc5b808d9e1655e80e3c628 SHA-256: 25f28cdc3dd7f24c25ae25bedec51ab55d3990810d34136cc5c473e3c46cb8d4
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://trafffi.ru/strik?utm_term=gunblood+unblocked+76 PDF link annotation
    • https://luvoseguz.weebly.com/uploads/1/3/4/6/134665560/d12ab391afb.pdfIn PDF document text
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/jaluder.pdfIn PDF document text
    • https://dulipitigisol.weebly.com/uploads/1/3/4/7/134717891/7ea985b36cad3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459939/normal_5fc3d23ad31c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5fd261e04f2e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc6ab11d49dd124475cb831/t/5fcc1835fe657040d5801cc4/1607211062137/hunting_season_wife_memes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10aaaf9866f3fd2d521c0/t/5fcfbe6fa9ba7760e6c02c86/1607450223684/ninja_chef_blender_soup_recipes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc00a5311f6a4198480ec6e/t/5fc17125e6d49a06bbc8da85/1606512935406/lidetewipenuzup.pdfIn PDF document text
    • https://s3.amazonaws.com/juxatop/city_siege_3_unblocked_hacked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8be7742-e8a1-4799-a1b0-78fc04b955a7/13369627408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/077c25a2-47aa-49b7-9cff-ca3569810073/73253702191.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000eaf1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEAF1 20960 bytes
SHA-256: 8c78b9be90dfd062cae380f2860285f0b3150908d75b0bba8015c3a6544b26e4
font_00_sfnt_off0000b9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CB 4916 bytes
SHA-256: 0839c40d5ab0adc676311b1f41c471becfa42ced50d8b466bad8204e9e54ff4c
font_01_sfnt_off0000caa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA7 9440 bytes
SHA-256: 531d67cd477c38108b96d82d91d00d0eed91a469b6e8d812151f2def50e88165

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