Malicious PDF — malware analysis report

Static analysis result for SHA-256 b474743e1f8e4580…

MALICIOUS

PDF

81.9 KB Created: 2021-02-17 06:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5a06bad9582b8e7eeac584d37ac569c2 SHA-1: f83969397e5fe863cb9698889495018aab00fcbe SHA-256: b474743e1f8e4580f06954e1f7e8e88845041e5a4d1dd831e59189775dcabe71
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to the PDF generation tool and potentially a lure related to 'power washer pump oil', suggesting a phishing or scam pretext.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+kind+of+oil+goes+in+a+power+washer+pump In PDF document text
    • https://cdn.sqhk.co/vopupevomate/wab8gjH/home_design_3d_gold_free_download_for_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/sajixobuko/Hijjdha/nisulugolu.pdfIn PDF document text
    • http://gsmall.space/vojiv6gzs7.pdfIn PDF document text
    • http://lowuwirakob.66ghz.com/41145980539.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5fe3d748a78cd.pdfIn PDF document text
    • https://cdn.sqhk.co/wegodimumod/jdl8gjV/ridugovojasisowudofeber.pdfIn PDF document text
    • http://tonagruz.ru/television_show_quiz_questionsvisd2.pdfIn PDF document text
    • https://cdn.sqhk.co/toxodimina/jaZ69dl/free_ff_stickers_for_whatsapp_2021_wastickerapps._com.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/fgvGihy/dj_record_scratch_sound_effect_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_5fe661768ca9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387701/normal_5fee9af078f92.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/hjahhGv/rovulora.pdfIn PDF document text
    • http://zuwatujusuz.22web.org/35572456063.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lenawevurokolup.epizy.com/astrology_science_or_superstition.pdfIn PDF document text
    • http://kenovog.rf.gd/the_boondocks_season_4_zip.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 5624 bytes
SHA-256: 24b81ef62f58965d041a1c06f6557c094ff8f2fc7b243f21aae16fc34ebac81c
font_01_sfnt_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 11888 bytes
SHA-256: 113519c17db31f686df5beb4c7bfa14a9d7c6fe3f3929e19d1d12e641ff3af52
font_02_sfnt_off0001254a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254A 16076 bytes
SHA-256: d4a88a3a8205faafa880075823aabd831252e3f8020b7d06daf30e92536d8b86

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