Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73a5e6bc54cb80a…

MALICIOUS

PDF

70.8 KB Created: 2021-04-22 20:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 37c9f38850426eea8e130b6f3740e30b SHA-1: 11f022802ccd9ea82ba8a7688b907a803c83d70a SHA-256: a73a5e6bc54cb80a3628e54c3ae7985d7057f4a8e4ab4b2600d409aa2c546eec
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://leonvi.ru/strik?utm_term=what+food+have+gluten+in+it PDF link annotation
    • http://vixegoxufareka.getenjoyment.net/vimexonomokisofaxake.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Gijjhq7/vepoxonojimugapotap.pdfIn PDF document text
    • http://volelovapudexif.scienceontheweb.net/tabunapu.pdfIn PDF document text
    • http://viriruxik.22web.org/catecismo_mayor_de_westminster.pdfIn PDF document text
    • https://bikojeril.weebly.com/uploads/1/3/3/9/133999271/5047631.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikewe/pijd2gi/31245787554.pdfIn PDF document text
    • https://cdn.sqhk.co/budotedo/Rjdeiep/pegiwuxufegivufadepe.pdfIn PDF document text
    • https://vupimolafi.weebly.com/uploads/1/3/1/3/131398504/7178341.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/731698.pdfIn PDF document text
    • https://fegesimi.weebly.com/uploads/1/3/5/3/135341766/wajipadewepusezegagu.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/aijjajj/wileduvuliriwafaviduliwa.pdfIn PDF document text
    • http://sozefavi.22web.org/dopanokokesevorijezulagon.pdfIn PDF document text
    • http://zikevamakag.mygamesonline.org/behringer_x32_digital_mixer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gexegufikide.epizy.com/free_indesign_template_presentation_folder.pdfIn PDF document text
    • http://damoserik.epizy.com/3777429082.pdfIn PDF document text
    • http://kudadurazeze.rf.gd/farmall_super_av.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e8e664-b80b-471f-9cab-adfae31aac7e/xemosisifed.pdfIn PDF document text
    • http://nukuwura.rf.gd/dijasetoluwuxazigekadex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9361a97-aa34-4cef-a36d-39d45ceaed2b/84244848549.pdfIn PDF document text
    • http://nowamas.rf.gd/how_to_thaw_out_frozen_ice_maker_water_line.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_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 4968 bytes
SHA-256: 1f088b2ba4f0e20f6f5cd8d0de122a9761ee162d03c063d067407e5bf6258a9b
font_01_sfnt_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 10256 bytes
SHA-256: 1295585f3fb317055c2de3d03fa7310e10f0368c16afd350dcdd9281c7027cfa

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