Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d4182b8e241378…

MALICIOUS

PDF

72.8 KB Created: 2021-09-25 12:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e12f190fbc85b01cdf668b2b88463316 SHA-1: 38e51627dfad1bf010deb4a4a459b9808df15d0d SHA-256: 55d4182b8e2413789d157bdb55d7483fbed92b3d93c097b0b5b86fc68868cff4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct hosts and links, suggesting a coordinated effort to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://valve-toho.com/userfiles/file/jumavulokibujagixodop.pdf
    • http://gr-chem.com/upload/files/lirixejigomotamevuguduto.pdf
    • http://nhuaduongnhapkhauaz.info/upload/files/lukisabafabusep.pdf
    • http://3gr-group.com/ci/userfiles/files/96682341893.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2f06dd5e75e7394733a50c87f43dc1e2/xobetadixerekanumib.pdf
    • http://industrialsupplies.pk/userfiles/files/37307240860.pdf
    • http://b40555.handyfriendship.com/upload/files/zemivivizuz.pdf
    • http://d-a-s.cn/userfiles/file/wodazorerafakuvopama.pdf
    • http://maginsaatmetal.com/resimlerfiles/fativofupusotimoza.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/qq5ivkk2lco65mhn1upvf3qj9rruap3a/susetonurosojuxuk.pdf
    • http://vigova.com/Images_upload/files/94572541168.pdf
    • http://detskaoptika.cz/ckfinder/userfiles/files/dixoxapebakabopulikotajib.pdf
    • http://fields-on-earth.com/images/blog/file/78845990788.pdf
    • http://aktifimmo.lu/userfiles/files/36879099999.pdf
    • http://daugiavanthienphuoc.com/media/ftp/file/98778126770.pdf
    • http://xhzhengli.com/upload/kisomepawugimifos.pdf
    • https://pediatricpotentialsnj.com/PP/PPpng/files/72697273173.pdf
    • http://baheth24aqari.com/ckfinder/userfiles/files/41766778096.pdf
    • http://tuclubcr.com/campannas/file/wuwive.pdf
    • https://cyklo-wellness-penzion-palice.cz/content/zozalezagejivetapagusefub.pdf
    • https://maritime-models.com/userfiles/file/ruxege.pdf
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/29482460590.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/rekozuxelejogarukiduveton.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=age+of+empires+2+definitive+edition+apk
    • 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://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_off0000b44e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB44E 16792 bytes
font_01_sfnt_off0000cc65.bin
6175ddf6c4a918e35e2acb75342fe1f2346333b0247f58edb9856414583d8e8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC65 11052 bytes
font_02_sfnt_off0000e603.bin
ce45e5dba1c2ad40af3ced18bb76db7c9b2ebdab9ce47f2992c6b1db732ffec2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 18188 bytes

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