Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8679cead4ea69b7…

MALICIOUS

PDF

71.3 KB Created: 2021-01-21 21:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c38f76cd82b2c32c373318a6147b9ae2 SHA-1: 4284b40365803805600b1af5b9da95ace207031b SHA-256: a8679cead4ea69b72c14e6e844be54d02b7360782ca548f60068beac27548a8a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, indicating a link farm or SEO spamming technique, with URLs such as 'https://druttle.ru/123?utm_term=kc+undercover+season+2+episode+23+dailymotion' and 'https://cdn.sqhk.co/xamubana/ge2Mjbo/turbo_racing_league_free_download_for_pc.pdf'. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its direct user-facing content, but the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful sites.

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 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://druttle.ru/123?utm_term=kc+undercover+season+2+episode+23+dailymotion PDF link annotation
    • https://cdn.sqhk.co/xamubana/ge2Mjbo/turbo_racing_league_free_download_for_pc.pdfIn PDF document text
    • https://tenadugal.weebly.com/uploads/1/3/2/7/132740541/rotab_kezasufemutedi_lurujudufir_futepopo.pdfIn PDF document text
    • https://cdn.sqhk.co/xapewiwud/EP6hbif/21420200971.pdfIn PDF document text
    • https://lewezuwarekizes.weebly.com/uploads/1/3/4/0/134040914/3366097.pdfIn PDF document text
    • https://cdn.sqhk.co/rukeditele/Mgi5kqL/rolazipavejefirunegag.pdfIn PDF document text
    • https://sibujoxosuzeru.weebly.com/uploads/1/3/4/4/134499285/8124117.pdfIn PDF document text
    • https://lojopozubog.weebly.com/uploads/1/3/1/6/131606756/5272516.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/ohghvjh/50473733486.pdfIn PDF document text
    • https://cdn.sqhk.co/pojukitogex/dh3tijc/madness_combat_9._5_theme.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/34MjgXW/sajomivugemaruxoxidoju.pdfIn PDF document text
    • https://sekugiwa.weebly.com/uploads/1/3/0/7/130739582/5541819.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/ganubatebedoxez/jalilatil.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/factory_format_iphone_5.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/fufirenojevewurikimere.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/apa_style_book_6th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/jodonarezetivugadusi.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_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 5648 bytes
SHA-256: 1fa521ac97a0e00b45170f4d3f867d4f2c5092c5857ab5eb8784fab219657f89
font_01_sfnt_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 10812 bytes
SHA-256: 8a45dc884268788e88640667a1ae39b192866c71eccdccc7c5eac96ce992ab16

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