Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda18c771a1a9e00…

MALICIOUS

PDF

81.5 KB Created: 2021-03-12 14:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d7f143d0c4976909b9e87e93bf327c26 SHA-1: b9b587fd6ee009cb0daface1f40c2dd1076c14f0 SHA-256: fda18c771a1a9e007b7064a4a4e80c0b532f00b3113188b2204597f7eef4ed0f
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also flagged the PDF as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The primary attack pattern involves redirecting the user to malicious sites, likely for phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=benzocaine+synthesis+pdf In PDF document text
    • http://dotixomovi.sportsontheweb.net/kijobuxizemijokuzoxim.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/11856501038.pdfIn PDF document text
    • http://coins24h.com/rapidex_english_speaking_course_free_downloadbzmc8.pdfIn PDF document text
    • http://prizinsta24.site/vscode_java_extension_packhbyly.pdfIn PDF document text
    • http://leaninrzpd.site/38631975838rdc6o.pdfIn PDF document text
    • http://zupanito.iblogger.org/barnabas_video_songs.pdfIn PDF document text
    • http://gmetry.online/how_to_record_purchases_on_accountlnit2.pdfIn PDF document text
    • http://koponegigat.medianewsonline.com/3672949921.pdfIn PDF document text
    • http://socialwave.me/gagurolitesifupatazi8za32.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/juwovaniwogafugelejel.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/32823791825.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/dd_online_free_play.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wejopapoxevore.epizy.com/formulaire_aide_mdicale_d_tat.pdfIn PDF document text
    • http://faxipobusevive.rf.gd/antihypertensive_drugs_pharmacology.pdfIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_dc2d77d40e344640be065351f1fa2122.pdf?index=trueIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_9ff399bc302d4ba4a08bad236679cf24.pdf?index=trueIn PDF document text
    • http://velelakolifuvu.onlinewebshop.net/60414178764.pdfIn PDF document text
    • http://newotev.rf.gd/76094448939.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 5104 bytes
SHA-256: 5beb92ee93dc6795f300689faeb84f7d6eb0319a47e1eaeea940d8bd9d696590
font_01_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 14164 bytes
SHA-256: b6aead09403a6714dc9eb53198ffe972049bfd7c23af868552a2359f97d64370
font_02_sfnt_off00012add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADD 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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