Malicious PDF — malware analysis report

Static analysis result for SHA-256 57da5b01a3e41bf1…

MALICIOUS

PDF

79.9 KB Created: 2021-10-04 20:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bda08ea53a00c1333ed0d6bcfa37a0a7 SHA-1: c862b0da0cb03e57490f0262eb1b52e59ae85406 SHA-256: 57da5b01a3e41bf1455ff092018e2873175b0988584103fffadd854017f2e474
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://viceda.com/userfiles/file/karovuvos.pdf In PDF document text
    • http://architectureanddesign.it/userfiles/files/58959627180.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/11510250338.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/54092393968.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16156de76d5d6a---5227550383.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/lojigomisid.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/jalidupifagumos.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/fisijafofawumu.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/c9f32d5c73945f769910c0035df58af8/wupunumukefireta.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/dimireg.pdfIn PDF document text
    • http://zenithmetals.com/files/sajelawixul.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/wutunis.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/26439894022.pdfIn PDF document text
    • https://matrixx.lu/images/zinir.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/48419747067.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/sipijikikof.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/22024781804.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/8097039574.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/63124908124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=reduction+potential+meaningPDF 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_off0000ccfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFA 20144 bytes
SHA-256: 9e2db44550711f2b18d7568e3a3f0a1dfa47d59d056b72d60d8bc8f3788e8e2a
font_01_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 10736 bytes
SHA-256: 440b5f8a798e03d025f0406ff7a354c7728b404645fb89899dcfb51a4516ccaf

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