Malicious PDF — malware analysis report

Static analysis result for SHA-256 376f149430ad09fa…

MALICIOUS

PDF

71.1 KB Created: 2021-01-10 21:33:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5e2b2f7bc9ed2ba30601cf0a9e1f945f SHA-1: d8008e7dc7cc60d598af5628e59b40dd8619d904 SHA-256: 376f149430ad09faa8260b4ead801e59804cd71cc73be45693953398ce6be00a
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, one of which is a link farm designed to redirect users to potentially malicious content, specifically a Minecraft APK download. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0' strongly indicate a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this malicious intent.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/123?utm_term=minecraft+apk+12.0.28 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4530457/normal_5fb3cdddd281a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5fbd10c4f16be.pdfIn PDF document text
    • https://site-1176842.mozfiles.com/files/1176842/8th_grade_science_questions_and_answers.pdfIn PDF document text
    • https://site-1173528.mozfiles.com/files/1173528/66664103951.pdfIn PDF document text
    • https://site-1176527.mozfiles.com/files/1176527/space_invaders_arcade_game_free_download.pdfIn PDF document text
    • https://dasowafajego.weebly.com/uploads/1/3/4/7/134723411/3186171.pdfIn PDF document text
    • https://site-1195597.mozfiles.com/files/1195597/diwamixexigomim.pdfIn PDF document text
    • https://satobawugeg.weebly.com/uploads/1/3/4/7/134701522/zavagotagerare.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370078/normal_5ff57e322575b.pdfIn PDF document text
    • https://site-1168163.mozfiles.com/files/1168163/bally_s_executive_king_suite.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/062527ec.pdfIn PDF document text
    • https://site-1084247.mozfiles.com/files/1084247/aspectos_biologicos_de_la_adolescencia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411696/normal_5fb465850e6a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 5420 bytes
SHA-256: b597e606b83b88d4fa01a4e29fba482227a4752a8d3de0bfcecdccd2f4f4d789
font_01_sfnt_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 10740 bytes
SHA-256: b99af24059fc2b62bb693e338aaa4b01da184f2eb618d12a2eab13b6be8260b5

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