Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebe75450c50e45da…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 22:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b739822c3671a5b9ecf850bd8ef0255 SHA-1: ed50efbc5376e74a71834232788aee3fba81b8c9 SHA-256: ebe75450c50e45da2fb09e861dadadbff17b85f856f4716ec311c3a0396f01df
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this behavior, with many distinct hosts and a high number of links. The ML classifier and ClamAV detection confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=super+fancy+pants+adventure+online PDF link annotation
    • http://caycanhtuyhien.com/uploads/image/files/tazokodagixuxo.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136070930084---tujujofa.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/071858498672.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/zedukixalaxirijezaxutowom.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/35846332081.pdfIn PDF document text
    • https://begili.com/uploads/image/files/zimavepa.pdfIn PDF document text
    • https://maria-galland.ru/files/file/52630801484.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/tikeroralofomerumabokalet.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/pezonuvizitunezulov.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/41901038329.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/dojesidokopozojaje.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/85559419758.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/19517949339.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/gujopizunepobebipoxeno.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/37174467357.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/51052705251.pdfIn PDF document text
    • https://doitoutdoorz.com/file/MXz5ghTtGkrQ0kwL.pdfIn PDF document text
    • https://shibbirs.com/media/files/60291867242.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130c2ba9dc1a---suwakevovon.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/11923482984.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/ravikewegilunutipopubi.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_off0000d9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 18600 bytes
SHA-256: b06664bf20aedea3a0a52efbdcfe35963b080a273dd352e5d5b454df01367666
font_02_sfnt_off000121f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 10968 bytes
SHA-256: b7df1e09fa7b56b26d7992c3559987d679d099b8b6eb6c98e46342dbd07ca50d

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