Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d0748d531f3201…

MALICIOUS

PDF

95.0 KB Created: 2021-09-20 10:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1bed5120343ebb8b3f04206d3c3c075 SHA-1: 34721863cfc01ee0f6cfcd953cb51e63b08c7051 SHA-256: e5d0748d531f32018d08bb961ba329786fdc33625d12fb35a1f75c927c851f44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including one pointing to a link farm, suggests an attempt to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains metadata from wkhtmltopdf, suggesting it was generated programmatically, likely to disguise malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hrampetraipavlavosstanovlenie.ru/content/images/user/file/xejowitususasafapowi.pdf In PDF document text
    • https://mashura.co/userfiles/files/67769046940.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/97083556847.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/dotudujelakuk.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/92862269839.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/ruvelovaxuru.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/bedufetiv.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/ruliboxif.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161413090bb711---1061757188.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ecf20tt0pq53lbgojek0cln945/17273808943.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/nexobeguvujabubajusaram.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/15585192314.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/22020204468.pdfIn PDF document text
    • https://irantruck.ir/data/file/bepakelud.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/14893487310.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210914_101233.pdfIn PDF document text
    • http://robbes.nl/media/files/9565997940.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/86872363924.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/nogojezonobovutepizij.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109140018485679.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///dunibavulepefufitas.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/detokazufavijiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=land+purchase+offer+letterPDF 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_off00010bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CD 19432 bytes
SHA-256: 6647c7543a3f07f6aab4c48baaa4ef6f226c89d6ac3bb1864e985d193764b0ec
font_02_sfnt_off000155e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E2 10680 bytes
SHA-256: 39ab43af1daf5a14a7b3767c5d18802c2a164599f4302f995e0b98aa34c907fb

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