Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93e714ce102af46…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 04:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 84b7940fae93b79e83e55062851f397c SHA-1: 7112cd7d01afae945df82cffc54b6d2f75587335 SHA-256: a93e714ce102af461716e8464d25f0f37e59268b8f30c99b90b2b54536df1596
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=how+to+change+geolocation+on+android PDF link annotation
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161466445b4549---vasuruxegaxafojasu.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/87669834590.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa2c76ab98---42980829997.pdfIn PDF document text
    • https://rcot.org/userfiles/file/19183791823.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/musumemijekiselapavu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/valamojuzabugoxaxaxo.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/bemoredobobukaloxibebow.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/86515578664.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109071524119647.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/19554540475.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/78065779947.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-13/20210913044717548841.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/kerugafatizo.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/58896735422.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109161522069497.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/dajolo.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/74498851267.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/67094888253.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/kuwawix.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/62667111851.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/50380380187.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/50469113299.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210908161011.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/nebotapupuma.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_off0000c226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC226 10560 bytes
SHA-256: 835a1f9e5c771c8160a1ca394ec33a92cffcc2ccf0a59503d93c7db0a721fd67
font_01_sfnt_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 17260 bytes
SHA-256: 5145c3d0dd14e302a1186ce0b1935d438a1198093d0d670a3e8b3cb62a63e79e

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