Malicious PDF — malware analysis report

Static analysis result for SHA-256 635fe5edf51fa066…

MALICIOUS

PDF

82.1 KB Created: 2021-04-04 16:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3da3ca63974c4f17e54d25548105f15 SHA-1: 7ce2b8e53ef96a656faf28672925fe0f84534984 SHA-256: 635fe5edf51fa066ba2d6e3957ab75ffbe2ea084b3574cc8aadc34522ac1b834
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure itself is used to host and redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=samsung+galaxy+j7+tracfone+qvc
    • https://cdn-cms.f-static.net/uploads/4480161/normal_60259b224d459.pdf
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/27cafcc009a4fbf.pdf
    • https://cdn-cms.f-static.net/uploads/4461232/normal_606371cf43216.pdf
    • https://cdn-cms.f-static.net/uploads/4413564/normal_603f7aab34f16.pdf
    • http://drovazvenigorod.ru/apus_library_style_guide_for_majorsdj569.pdf
    • https://vetasokimatajed.weebly.com/uploads/1/3/5/2/135296406/kakimewi_xesujumo.pdf
    • http://zoomita.space/free_violin_duet_sheet_music_hymnsv42op.pdf
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5fdc781e1e17f.pdf
    • https://cdn-cms.f-static.net/uploads/4456393/normal_60690ff143c10.pdf
    • http://visatog.22web.org/nenuneja.pdf
    • https://cdn-cms.f-static.net/uploads/4455174/normal_6035bcf284baf.pdf
    • https://cdn-cms.f-static.net/uploads/4390995/normal_601305dc1d9c1.pdf
    • http://sepibuzare.22web.org/17623730029.pdf
    • https://cdn-cms.f-static.net/uploads/4452834/normal_605dda20462fd.pdf
    • https://cdn-cms.f-static.net/uploads/4410447/normal_6049d3399a0bd.pdf
    • https://kapelivoxiri.weebly.com/uploads/1/3/4/0/134040857/3110700.pdf
    • https://fetubuka.weebly.com/uploads/1/3/1/3/131379928/8373432.pdf
    • https://xadajosawot.weebly.com/uploads/1/3/1/6/131636584/7288581.pdf
    • https://cdn-cms.f-static.net/uploads/4382958/normal_6040bee4dc2cb.pdf
    • http://design-kvartira.info/juwugesusrbvmt.pdf
    • http://megantv.site/44889565905785sf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tubupokus.rf.gd/best_android_call_blockers_2019.pdf
    • http://tamufigavoxi.rf.gd/how_to_find_interior_and_exterior_angles_of_regular_polygons.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea31.bin
edaa5118382e578cb7aa348350ac18181468e5a7fe8769176a6894477cba9eb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 5816 bytes
font_01_sfnt_off0000fe05.bin
791313564c89bf2166ad12c8b96c94ee3ef3786c74b4c2d7f5b560a1f29793a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 11084 bytes
font_02_sfnt_off000123ed.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 16164 bytes

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