Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25340eb20a0bb3b…

MALICIOUS

PDF

91.4 KB Created: 2021-03-24 12:22:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7361ee1f8cb6efeaae31cfe97ecf8d71 SHA-1: 7e704e9c56d3fa931434ed92e87b572cc6ab12d7 SHA-256: c25340eb20a0bb3b7facc625fbfdb819b0993cf4ad8fed2ea07441af5ca0d963
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including critical detections for PDF_SEO_LINK_FARM and CLAMAV_DETECTION, indicating a phishing or malicious content distribution scheme. The document contains numerous external links, many hosted on disposable domains, suggesting an attempt to redirect users to potentially harmful websites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=is+diablo+immortal+out PDF link annotation
    • https://cdn.sqhk.co/tatogevi/hcjeGhc/long_acrylic_nails_challenge.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/c96he3B/new_english_song_video_djpunjab.pdfIn PDF document text
    • https://ganupedudajoz.weebly.com/uploads/1/3/4/5/134586443/jagukav.pdfIn PDF document text
    • https://zagiwesojuju.weebly.com/uploads/1/3/2/7/132712322/d3d754.pdfIn PDF document text
    • https://sajenaviwabawi.weebly.com/uploads/1/3/4/2/134266368/jakutezefule-pixodunusolobaf-jokafadavawedem-zoralab.pdfIn PDF document text
    • http://svoytrylend.xyz/bumibipobujafozenoxhc9y.pdfIn PDF document text
    • https://buxudirikebipur.weebly.com/uploads/1/3/1/1/131164004/xodekepuridexeb.pdfIn PDF document text
    • http://budivev.scienceontheweb.net/2634095936.pdfIn PDF document text
    • https://fitelibisubun.weebly.com/uploads/1/3/3/9/133987071/0983debcc3bc.pdfIn PDF document text
    • http://tokiridevifo.medianewsonline.com/95552154375.pdfIn PDF document text
    • https://welirupew.weebly.com/uploads/1/3/4/6/134662060/5634193.pdfIn PDF document text
    • http://bulepozobagepud.mygamesonline.org/98305012139.pdfIn PDF document text
    • https://puwowuxavuz.weebly.com/uploads/1/3/2/6/132682233/jamipudojof.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/eTjijj0/bdo_cooking_mastery_vs_speed.pdfIn PDF document text
    • https://lutenidu.weebly.com/uploads/1/3/4/3/134398581/7360605.pdfIn PDF document text
    • https://wivezinafixozut.weebly.com/uploads/1/3/0/9/130969190/6057663.pdfIn PDF document text
    • https://cdn.sqhk.co/fidapulano/idBhfji/steven_universe_warp.pdfIn PDF document text
    • http://justiciaforjustice.com/fast_and_furious_1_download_in_hindi3h5uw.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/1341215828.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/71770557-da5b-436e-baa6-2c175d9cb955/zudafifiloraxodogawojuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c71ae5-db59-467c-9a96-fb9faa5f0bf1/58909046191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0cc80ab-120f-4c3b-8769-b7d9d3d3d4ec/kodutosezijagezufazonidig.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_off0001270a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270A 5048 bytes
SHA-256: b4abd78f858e288597c164a1ce411eb70fbee11eb14d954fbf13e4ca02fb2451
font_01_sfnt_off00013815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13815 11380 bytes
SHA-256: b1cab881b0a596f59df44c66f1a4d924eb0fad3367c4a46c05b3812213b0d496