Malicious PDF — malware analysis report

Static analysis result for SHA-256 c632432f7c591db7…

MALICIOUS

PDF

74.4 KB Created: 2021-03-03 23:21:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b05a6b9a1fcb27e0fd3a79f3f4d068bc SHA-1: 4a442d3442f942ecceb5ea493f5322cba90283b4 SHA-256: c632432f7c591db71ae4d1999cc49faef63b4284653c29478e7506dac78d1224
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt, likely leveraging the document's deceptive content to encourage user interaction with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=spanish+to+english+translation+book PDF link annotation
    • https://cdn.sqhk.co/kozuvurop/Zhia0P1/deleted_messages_icon_iphone_6s.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/bass_guitar_fret_note_stickers.pdfIn PDF document text
    • https://dosodufixelo.weebly.com/uploads/1/3/2/6/132682620/c4ee9bc12a6674.pdfIn PDF document text
    • https://sawonelezaxiso.weebly.com/uploads/1/3/4/5/134588179/pureremikapinebexe.pdfIn PDF document text
    • http://lisolu.org/norton_introduction_to_literature_12th_editioneb69g.pdfIn PDF document text
    • https://cdn.sqhk.co/silijebutu/jeZXjjT/hitman_sniper_challenge_xbox_360.pdfIn PDF document text
    • http://cpskras.website/baby_shoe_size_guide_by_age_uk57sr5.pdfIn PDF document text
    • https://fimizugowukabi.weebly.com/uploads/1/3/1/1/131164572/9748616.pdfIn PDF document text
    • http://optarfes.com/logo_undip_png_hdscrif.pdfIn PDF document text
    • https://fofumizuzel.weebly.com/uploads/1/3/2/7/132740209/volaxolerusiwe-gakakazodoninos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/zizesolubekoguwewogola.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/56670262736.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/nugipefuludabemewopo.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/12658931679.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/lusezajomijupi.pdfIn PDF document text
    • http://bitenozof.atwebpages.com/is_irobot_braava_worth_it.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_off0000e807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE807 5388 bytes
SHA-256: ce22542f2b83a59b796f26b99bedbceafc68877f3261900f124ebb2e62b91c01
font_01_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 10084 bytes
SHA-256: 2f0b1e452cdd2a1a63f047b8683a60244f70b544aca0a422f61ca8de455fa68f

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