Malicious PDF — malware analysis report

Static analysis result for SHA-256 94104bb14c1408f9…

MALICIOUS

PDF

70.5 KB Created: 2021-09-12 22:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7265ef3d47412150708377488b66559b SHA-1: d65c2b3c25f8465018dae07c418fb342bb906b2c SHA-256: 94104bb14c1408f9858b5ac5382bece2b48e22c4572743d2a9a5f1b28e805a8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a link farm detection and a machine learning classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to unknown domains, suggests a phishing or redirection attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lead users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mrcubezpieczenia.pl/app/webroot/media/files/29095458740.pdf In PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/7180132125.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/zawibafojipiximuxama.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/19934317282.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/64354497137.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/61719738013.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/lerimejubiba.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109110100472647.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/71814570488.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/97932617410.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/bomovelog.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/86564646333.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/70558396421.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/31109370375.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/madenojadipovowisodawe.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/97887579266.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/rewininale.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/rajumidudujokulidezek.pdfIn PDF document text
    • http://rayer.cn/d/files/movexosu.pdfIn PDF document text
    • https://curvy.tw/upload/files/xugaru.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340ae5b5193---42310350733.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/65530885380.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/7400296546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=video+in+background+androidPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/gesalibejebawup.pdfIn PDF document text
    • 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_off0000b5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D8 10532 bytes
SHA-256: f09a904a42cf4a06035d9a32c9f17d75a7fb03c10418863a8ab4f898532c36a4
font_01_sfnt_off0000cdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C9 15288 bytes
SHA-256: 9ecee1e35b07c644f61adf73f31467afb57a70519b53e2ca30946627bfbf49c5

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