Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd707cad20090ca…

MALICIOUS

PDF

94.0 KB Created: 2021-03-10 19:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4298f6f11f6267838eed0907a463e2d8 SHA-1: 8e66ddf3fad85a18c420bf4719d2bab3c656b687 SHA-256: 9cd707cad20090ca5577fb517fceee8e8803e11a6364a7e2de5d7c7b5c512820
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting. Heuristics indicate this is a link farm designed to direct users to malicious sites, consistent with phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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 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.
  • 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=brasser+sa+biere+pdf In PDF document text
    • https://xobalodag.weebly.com/uploads/1/3/0/7/130739625/vifezum.pdfIn PDF document text
    • http://wimokarekore.22web.org/ferejetinefurogodevoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489835/normal_60391968ee7d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458848/normal_6004beb124e86.pdfIn PDF document text
    • https://dugubutufafug.weebly.com/uploads/1/3/0/7/130775350/f47df75c0a9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_5fd67d1960629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_6017a7db0cfca.pdfIn PDF document text
    • https://bavipakodotem.weebly.com/uploads/1/3/5/9/135958795/badelukulikem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/07bebe68-ce0f-4fe5-abab-c53ea5c78236/89482513938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd50904a-de72-4dbe-86f0-81d6a8bca331/35425273337.pdfIn PDF document text
    • http://xekifoxudiduvaf.rf.gd/pafiliguduki.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/tipos_de_funciones_con_graficas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d293cb7-27e6-41a0-8161-dc411a34853e/zoporabebuzudafudipal.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/36491404262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b10fb0-edbd-43de-bb9d-79729d9fa161/how_to_read_the_bible_in_one_year.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/392aa4f9-cc08-47cb-9157-a79f34d12ed4/what_does_religion_mean_to_me.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/clear_messenger_search_history_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f9e427c-b9a4-4e0b-84f1-5f0bf5a36828/82027064808.pdfIn PDF document text
    • http://digopepu.epizy.com/34170345968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a1c2e2-71f8-4d24-886d-96cd1ca9feb9/remington_model_700_sps_tactical_range.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/fegilurane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b19ea62-8807-4e9e-92f9-687df104a69d/xewutamegimavasoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f46001-62e0-409a-bf3f-c832c05f9ecc/4124019467.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/47901197363.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A16 5192 bytes
SHA-256: 0b041df62ac36a2ca1227df7e366708ecd9c86a8cfa9537988e3bf7e36b98cfd
font_01_sfnt_off00012bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC5 12604 bytes
SHA-256: 9938e9e95ef095d9c11242a71a47cdf32f2a4c44ad43655997013d44c376f69c
font_02_sfnt_off00015347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15347 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660