Malicious PDF — malware analysis report

Static analysis result for SHA-256 245ee8f54d4496b1…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 15:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed2d0379f09214be93f00033269a3dd3 SHA-1: a0e772698d159953bf1ceb56eb9cf35e38609258 SHA-256: 245ee8f54d4496b1bcbb916ae99811dc2a676523f8a2fa2eeaafefd0d96d4a2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are indicative of attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bachtungcompany.com/upload/files/10924933200.pdf In PDF document text
    • https://dananeye.com/uploads/files/202109100737306636.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/remugepifidavusifiwidif.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/81836661185.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/xurogimuritofuwiponevir.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/rurudejogukamekekugi.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/debigerobotalepotu.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/zekirojasebuzu.pdfIn PDF document text
    • https://hse.tw/upload/file/15925851302.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/84142287826.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210922030412563.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/92177386384.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/28865108515.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/sujomenurimodagikagujeda.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/14245210569.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210906203048.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/kiwisukazovamolibodusefob.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6647dag8avpdrb6vjbj1fvrmqg/42546241924.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/34536560794.pdfIn PDF document text
    • http://onelove.cz/file/debotitapalu.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-20/20210920051731807374.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc5702b93---62690895801.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/63108242464.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/nejiwemofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cost+of+type+26+frigatePDF 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_off0000b064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB064 16428 bytes
SHA-256: 67fb45a46c7d8e45f056f9fad83cbee97a7a787f02e0bdcf4f4e6289258f0b83
font_01_sfnt_off0000db7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 10816 bytes
SHA-256: 904eb834e24e2696157ea1db555bce9533afb0b29f07dcaf18f8b5d052055955
font_02_sfnt_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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