Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb1533ceef018be…

MALICIOUS

PDF

80.2 KB Created: 2021-03-30 15:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5e62638acd77c4b49913a30038bd4f36 SHA-1: 2a100f6a259b1e3a01ab6ecf6331110a8616d551 SHA-256: 2fb1533ceef018bec1cb08605b7d062b92757cb6bb209d23f22ff730a357eb32
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, many pointing to benign-looking PDFs, but one primary malicious URL is present. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

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://midufefew.ru/strik?utm_term=norton+anthology+of+english+literature+9th+edition PDF link annotation
    • http://pifovabu.getenjoyment.net/duviduvifebofubisiwiwa.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/agilmente_libro_descargar.pdfIn PDF document text
    • http://maxiteguf.medianewsonline.com/58271375852.pdfIn PDF document text
    • http://libutulidux.medianewsonline.com/38601826221.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_8137b22f5a354b5d83020254f138a2b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/fluke_t100_voltage_tester_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/kazonuvimifevubugema.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/clinical_practice_guidelines_in_dental_settings.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/70050723313.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/86497797089.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/mishkin_money_banking_and_financial_markets.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/honest_work_a_business_ethics_reader_4th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/origami_modular_star_box_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/bingo_remix_song.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/defena.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/innova_3030f_says_done.pdfIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_8568c1dcddf84a91a8e09c586d620706.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divikufifir/minecraft_capes_skins.pdfIn PDF document text
    • http://popofisofol.myartsonline.com/atharva_veda_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/gojaverixilobakezobosikel.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_off0000fb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 5396 bytes
SHA-256: 63edf5ba5c297d84844c3733a4fb90a855479c455340afcd823feb94c43757bb
font_01_sfnt_off00010ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 10984 bytes
SHA-256: 72ba2f203d5121ff724a3d2b8a2273deafefe655ee855c0953c5d73335653276

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