Malicious PDF — malware analysis report

Static analysis result for SHA-256 e239c0f796504978…

MALICIOUS

PDF

77.9 KB Created: 2021-03-28 11:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 97a0ab912273a408b7dbad97a92ec9e4 SHA-1: 1c3320807cc46a4bb1c6494a56adb62a0a7a1c14 SHA-256: e239c0f79650497861143e2ec32facaedd77bd77f42934a21167ea35ff42b14d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are generated to appear as SEO-friendly content, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://pelibifir.ru/award?keyword=psychology+notes+pdf+in+english PDF link annotation
    • http://galilevulaxun.iblogger.org/line_6_spider_iv_30w.pdfIn PDF document text
    • http://ragesedanem.iblogger.org/frog_respiratory_system.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415935/normal_5fe0c2709339c.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/diare_akut_pada_bayi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415073/normal_6045563ae7d11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374840/normal_6057b8b5ac9f3.pdfIn PDF document text
    • http://totipuzuforaz.mywebcommunity.org/fiwinebelegibobazelagaru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_b2b63bda828f44af86c811eae34a603d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/how_to_get_rap_on_roblox_2020.pdfIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_4f2821cc53d5408199e284c5a31b4188.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/bullet_bike_photo_editor.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/rosencrantz_and_guildenstern_are_dead_unicorn_quote.pdfIn PDF document text
    • https://2a0daf8d-7d8f-48a8-9da6-1f2c606fcb3a.filesusr.com/ugd/adb9e1_1af749761484496899bd214b9da4cab6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/white_linen_sheets_king.pdfIn PDF document text
    • http://kijonag.onlinewebshop.net/texufizubalokixomedox.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/abbyy_transformer_software.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_ebea1bdb8e8643bd8d191baa182c5431.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jikopot/10151293078.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/pajijeburomovawimawamive.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_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 5212 bytes
SHA-256: 6f8057fe0c72cf39726889dc06f2af94816ce9f06ae0b80e3c1e89228e112f7a
font_01_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 11528 bytes
SHA-256: 3815978aeb3097d24797c881c7ed85d53832eeaa093112c2d8fe21994d0a3c62

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