Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f70764d461e162…

MALICIOUS

PDF

67.9 KB Created: 2021-10-02 19:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 18e3db95d0155c7649b680f4bc0c9160 SHA-1: 0f62d925a3342f1dc0c8d56b0ea46f731eea09cc SHA-256: 91f70764d461e162f22c267ca95486b94606048fd09cb1644f887faf7fbd1142
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. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('pistant.ru') that is likely part of a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's structure is optimized for link distribution on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://pistant.ru/uplcv?utm_term=human+physiology+ppt PDF link annotation
    • http://dansensvenner.dk/imagesfile///90727161769.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/8084946837.pdfIn PDF document text
    • https://best-label.com/upload/files/sixuxugomizemodu.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/jileletujevefomilezusuwux.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/farujofitimikeviti.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/sekuxidotokar.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615249fc4282e---rodutenumobuvovew.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/73084604936.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/4405139483.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/25516943926.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/pesuzo.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/29134258947.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/fajalap.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613861b38b314---nareziw.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210901225314.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/21168010730.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/kijetofunenibugema.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/31453451906.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://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_off0000ace5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE5 10672 bytes
SHA-256: 043b77dfbd6cb2c79319ada6d76a13e7de1d03262f04dc181fcd446f29972b8d
font_01_sfnt_off0000c51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51A 16252 bytes
SHA-256: 440fa956f55db5533e2c5b658d5de0d96b81a10abe460fbd696af4430b768097
font_02_sfnt_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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