Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfbd6a14e799d8e…

MALICIOUS

PDF

87.7 KB Created: 2021-09-10 00:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cac56dfd40c12131084bae420e7f73c8 SHA-1: c722efe00ebc5804ab49fb97b5f02d94d1d40633 SHA-256: 3bfbd6a14e799d8efc07b5863638d2fe3f11a5ca6f24dbe8d5ca3cba4c5c7977
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://silverspringabw.com/uploads/files/93534775994.pdf In PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/notuzokifosem.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/84823482430.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/57431479990.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/tflfaumpbkub7pl26vpeenn8o6/sewixafibiviwo.pdfIn PDF document text
    • http://aurora-c.jp/files/files/92739756338.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/66927127455.pdfIn PDF document text
    • http://taociren.com/upload/file/210909021319072001xpjb33fbz403.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/78391467561.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/13352260506.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/sutoju.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/66800817239.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/90515462344.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/sobadilojixuxujip.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/jinedipono.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/96646481551.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613452dae9890---65687239455.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/35273173275.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/kosojomipudufufutukemide.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/32868563105.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/35495049988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=anime+first+and+last+namesPDF link annotation
    • 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://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_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 21584 bytes
SHA-256: b71e0149a7911fffc67bfbc3de245dd930040880677b70ff594706fe6ba6caaa
font_01_sfnt_off00012228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12228 10376 bytes
SHA-256: fb0fb59454818f868eb27227192978826de48ec28129ff3c6cc43a9fd55eb15d
font_02_sfnt_off00013997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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