Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a8d8152a88fc1f…

MALICIOUS

PDF

89.6 KB Created: 2021-03-03 16:53:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7d4906866c909074280710d968ceb20f SHA-1: 855fe2403c92f80b222d17db326ec77ae1ba3270 SHA-256: 37a8d8152a88fc1f7e9def41255b8a6fb5cfc0b28ea9f9a7a196bf2606f22ca0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the linked URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=whispure+510+carbon+filter PDF link annotation
    • https://cdn.sqhk.co/nivavepe/hchagif/44956690822.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/325587e32bd.pdfIn PDF document text
    • https://dobivevoxopu.weebly.com/uploads/1/3/1/4/131453544/7309660.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/45f508e.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/eureka_forbes_vacuum_cleaner_service_centre_in_coimbatore.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/descargar_gratis_libro_tu_puedes_sanar_tu_vida_louise_hay.pdfIn PDF document text
    • https://lefitujeledezov.weebly.com/uploads/1/3/6/0/136028835/tifevudib_kevivan_bebox_texuf.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/jcghfgg/fast_drift_karts.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/FhgzsSw/classic_rpg_games_for_ios.pdfIn PDF document text
    • https://nutolifawivu.weebly.com/uploads/1/3/1/4/131437776/9361812.pdfIn PDF document text
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/4208081.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/jcLhd79/gazodaw.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/hfZzgjL/vemimegano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ligoroxenafof.atwebpages.com/how_does_globalization_affect_communication_and_the_world.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/how_to_improve_lyrical_dance.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/60951554580.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_off00011fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCF 5576 bytes
SHA-256: 12af0452d82e24ba7f9c8a77438c3b4656424b7bd1e4ee6f386c6a45329154f5
font_01_sfnt_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 11284 bytes
SHA-256: deb607d0c14ef14d3541c9cbd0ae8ecbcf230d91f41bb18608d1f119689dfb5a

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