Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a488f2225a0b99b…

MALICIOUS

PDF

69.8 KB Created: 2021-02-24 19:30:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7829f9a676663763aaaa6698b77399c2 SHA-1: 45cb1817b53629b43bfb0381feb9add7dd2c3bc2 SHA-256: 5a488f2225a0b99b7fcf5281665b959752c7f85681e7aa0fd5da60e9029afd00
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to 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 URIs are indicative of malicious activity, likely aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://seumenha.ru/strik?utm_term=4+pics+1+word+level+2395 PDF link annotation
    • http://mini-cam-v2.club/proshow_producer_templates_free_downloadudqzt.pdfIn PDF document text
    • http://amst-watch-v1.club/115584259573og5w.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/2jb9Rjc/fopigi.pdfIn PDF document text
    • https://kidubaviputotej.weebly.com/uploads/1/3/4/5/134520398/mejatif.pdfIn PDF document text
    • https://cdn.sqhk.co/lapitobexeva/2nQhgjc/safaku.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/xamafozilo.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/hhcgjgf/ludovico_einaudi_youtube_greatest_hits.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/ia1zMnF/desanorifokurowamagerobi.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/52977661851.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/7jfLoRj/otc_incontinence_medication_for_dogs.pdfIn PDF document text
    • http://checkyourcredit.info/neurological_assessment_form_physiotherapybrpa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424330/normal_601fb8644989a.pdfIn PDF document text
    • https://turoliletipusu.weebly.com/uploads/1/3/5/9/135969349/dupilugel-luvutoduwuru-nezuvuru.pdfIn PDF document text
    • http://bighome.space/43006605063nsyb8.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/gjXBgjb/word_swipe_games_free.pdfIn PDF document text
    • https://govotewimodiku.weebly.com/uploads/1/3/4/6/134649218/robetovitugibob-zonusikodazonon.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/agdhbW9/52796686541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454304/normal_5fd9f1db2677a.pdfIn PDF document text
    • https://cdn.sqhk.co/mukutosi/dhcha3R/gimulug.pdfIn PDF document text
    • https://cdn.sqhk.co/dejenuluzew/70yjigf/64752157180.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvarijes.atwebpages.com/65737620402.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_off0000d28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28C 5628 bytes
SHA-256: 6c1e15a95efbba63cb76784d1fbd73e170da791dee94f03e4c6c7a05de6eee35
font_01_sfnt_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 10688 bytes
SHA-256: 94cd06d5ff267d4c5a61e1d87acf2637e06ec8d0fcd57959353fcbefb47fccb4

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