Malicious PDF — malware analysis report

Static analysis result for SHA-256 8543836dc0351a3b…

MALICIOUS

PDF

76.5 KB Created: 2021-04-23 10:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 15e83f2c3b2fecf62cc36da70ddb29c4 SHA-1: 20691513083245e426f5d73e07677e87d59911d7 SHA-256: 8543836dc0351a3bc4b9def66c1f2aefcd1c5714554906483a276598a018790e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was identified as malicious by ML classification and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=how+do+i+connect+my+bose+wave+soundtouch+4+to+bluetooth PDF link annotation
    • http://walawatomu.mywebcommunity.org/supermarket_vocabulary_worksheets.pdfIn PDF document text
    • https://modezajuv.weebly.com/uploads/1/3/4/0/134097040/3e8aa8984f387.pdfIn PDF document text
    • http://gasurorir.sportsontheweb.net/sojegubuxodemigigeg.pdfIn PDF document text
    • https://remurefovedelag.weebly.com/uploads/1/3/1/8/131860204/6135086.pdfIn PDF document text
    • https://bonagimeduvutup.weebly.com/uploads/1/3/1/4/131453121/falofuwopub-rufumo.pdfIn PDF document text
    • https://xejukosaxup.weebly.com/uploads/1/3/1/4/131437924/dijubizujaju.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/dgcoaXD/world_cup_2018_table_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/folikulezig/RiiJokF/21319567375.pdfIn PDF document text
    • https://serijarivak.weebly.com/uploads/1/3/0/7/130776739/1446630.pdfIn PDF document text
    • http://juzezudusota.mypressonline.com/masuzakuneruluv.pdfIn PDF document text
    • https://tixipatu.weebly.com/uploads/1/3/1/3/131382495/buluraxitidejopi.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/63406128822.pdfIn PDF document text
    • https://cdn.sqhk.co/magatile/DhjghbQ/herpes_simplex_virus_isolation_precautions.pdfIn PDF document text
    • https://lokamafurixese.weebly.com/uploads/1/3/4/5/134509290/kimanafanu.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/Pjfjejb/12884441371.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/jopazatanegono.pdfIn PDF document text
    • http://wumugajus.onlinewebshop.net/meiosis_vocabulary_worksheet.pdfIn PDF document text
    • http://mogixos.atwebpages.com/30180662541.pdfIn PDF document text
    • http://zoligagomuwe.onlinewebshop.net/pdf_book_free_download_spoken_english.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_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 5528 bytes
SHA-256: c755835623f5045d86211d6e425aa974486f224da3425e66427ec1a43bf7bd66
font_01_sfnt_off0000fae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE8 11632 bytes
SHA-256: 7113db92c49395550bacd02778c26a624e5e03dbec5217888170876096399606

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