Malicious PDF — malware analysis report

Static analysis result for SHA-256 545574c2d18ccebe…

MALICIOUS

PDF

69.5 KB Created: 2020-11-19 00:16:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5edccdd62e544910e4b8a735866ac686 SHA-1: 142d467cf9c35c700b6be5fb567a5bbebd2de422 SHA-256: 545574c2d18ccebe090c06ff1f8c91d25f87603ccbe29ccaf060e409d39f251d
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting services and known malicious redirectors. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the primary attack pattern is the redirection infrastructure.

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
  • 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://traffmen.ru/123?utm_term=rdr2+witches+cauldron In PDF document text
    • https://finijuzado.weebly.com/uploads/1/3/4/4/134444754/gotibapovi_kugovikuxij_firukom.pdfIn PDF document text
    • https://furutivox.weebly.com/uploads/1/3/4/3/134360368/rajawidamaki.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/a790fc28ede4f.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/sakitivezilike.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/9755103.pdfIn PDF document text
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/6589686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f9385f8ba315.pdfIn PDF document text
    • https://jijalasigode.weebly.com/uploads/1/3/4/3/134344414/6431114.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/xivitozobab_vekem.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
    • https://s3.amazonaws.com/bubodeliza/geological_time_scale_in_botany.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c8d7404-1ace-4813-8dc9-48f12a7735e2/berejototoju.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/cctv_super_password_premium_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae957a8-75da-4675-b48c-4fa3affba932/xakufaxasulabepotof.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_off0000c70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70D 5140 bytes
SHA-256: 248b7e624ffb3352f26ac240050ceee36e5e0d3bf2696bb4682b1ccc26648c64
font_01_sfnt_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 10216 bytes
SHA-256: e7bc140e3205fe71333c0b982b9e7d20d02181b876adcad4a0e17f8071ae8124
font_02_sfnt_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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