Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f8f572fce87aed…

MALICIOUS

PDF

72.2 KB Created: 2021-04-07 04:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f26c8f6da38bb990667922249ad36cbe SHA-1: 54502eab3a8b7f584a51bc8489e492805885a479 SHA-256: 20f8f572fce87aed37845501b7fccff0d905bb934a5e7762ad65b341b3f6839d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://resalured.ru/strik?utm_term=monitor+de+signos+vitales+portatil+contec+08a PDF link annotation
    • https://pesudimudoselu.weebly.com/uploads/1/3/2/6/132681392/6bbbd.pdfIn PDF document text
    • https://fepiwifir.weebly.com/uploads/1/3/4/6/134676425/9920063.pdfIn PDF document text
    • https://vunorozixu.weebly.com/uploads/1/3/1/1/131163876/20664647b323c.pdfIn PDF document text
    • https://zomuwobab.weebly.com/uploads/1/3/0/8/130873958/23daca4.pdfIn PDF document text
    • http://zatomemogi.iblogger.org/ias_cadre_allocation_2017.pdfIn PDF document text
    • http://fuxezaboxekave.scienceontheweb.net/cartea_ugly_love.pdfIn PDF document text
    • https://siroxaje.weebly.com/uploads/1/3/4/0/134000026/469a18e.pdfIn PDF document text
    • http://jokojevuwurepip.22web.org/61726183650.pdfIn PDF document text
    • https://bevowodawalejap.weebly.com/uploads/1/3/4/3/134363876/5732092.pdfIn PDF document text
    • https://suzexumereda.weebly.com/uploads/1/3/6/0/136051641/71c477e687577ca.pdfIn PDF document text
    • http://xagevogewa.medianewsonline.com/38596562225.pdfIn PDF document text
    • https://xitozenajoxoge.weebly.com/uploads/1/3/2/6/132681812/4365144.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vonupov.epizy.com/18931935642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8642c3b1-515e-4e58-b16f-23cbe91e3b0a/97743291428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a8afa0-c539-4947-af73-567f6036a4ca/how_to_set_up_blue_clean_power_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cbb3a80-251c-4f2a-82b4-9438ca660832/65310458387.pdfIn PDF document text
    • http://wejelinemadagep.rf.gd/lemadeterinoguzal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7975ebd2-62f7-4414-9d1e-054403456bd6/46689133596.pdfIn PDF document text
    • http://fizijumopib.rf.gd/warrior_cats_kit_name_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8697d01e-b55c-4450-a81c-5508482608a4/what_is_the_opinion_of_the_supreme_court.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_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 5640 bytes
SHA-256: 15dc36243a7d14476847d0ff7599f8d92850cdd6bac6fdb62ba2734f79c248e4
font_01_sfnt_off0000ea2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2C 12220 bytes
SHA-256: 78a5d614c657181c2c8d58a565a65f960626cbe8bf99c44fd35fba2c49124c3b

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