Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c4fe8d7062742a…

MALICIOUS

PDF

68.9 KB Created: 2021-03-11 13:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a68b819d008aed82cbe6925b7b69be96 SHA-1: 9930cde9bd5e6caef3401080b995cdfb797914c2 SHA-256: 42c4fe8d7062742af0d2d4eab9f4398c79306d161e4ddb3c75f1e7f9f095d244
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to a 'Certificado de bautismo en agua pdf', suggesting a lure to trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xezojetit.ru/award?keyword=certificado+de+bautismo+en+agua+pdf PDF link annotation
    • http://flowerport.store/rofuvijokizowavafisafit4aft.pdfIn PDF document text
    • http://kapusta.pro/gizizuvusuds5osw.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/7eb38ec7-06dc-4664-a701-622dceda5e5f/58161057198.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/gufazukubanugodav.pdfIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_54beacb11ae8490ab29fb32d9bd6d7f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kumasala/gozox.pdfIn PDF document text
    • http://koxogulu.rf.gd/22313451203.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_19bceafc98034890920190f5663cc420.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadedosi/class_7_civics_chapter_3_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e14917b2-5b1d-4432-bf25-805e8f5b7cc3/45369022602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/087ee6fd-b074-497a-bc79-20cfc7cd1711/69535079627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1b7a1c9-7cc9-49b3-ac16-463e2cd2e716/sixafumikixeleb.pdfIn PDF document text
    • http://zunebodiz.epizy.com/vatujerusasomisowowu.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/harmony_high_back_booster_car_seat.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/story_saver_for_whatsapp_iphone.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_off0000ccf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF1 5488 bytes
SHA-256: 69ec9deb8cc2949bc300d7834aabff073f5a205314f63e7a81941dc3801574aa
font_01_sfnt_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 11416 bytes
SHA-256: 8fc65602d53edf09c13df02b34c7805c25df55059998394e69b5ba4829ebab74

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