Malicious PDF — malware analysis report

Static analysis result for SHA-256 448a6d099c0a5ea9…

MALICIOUS

PDF

71.5 KB Created: 2021-09-12 16:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23b178042eb20e4ef1d207af79e105a6 SHA-1: fe203e3a514c2e8fcf770dab9fb21a84e95c83a5 SHA-256: 448a6d099c0a5ea927a2bda8858005d9b29510414d17d485f56db690c23805ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are unknown or potentially disposable. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nakatarikaszel.pl/app/webroot/userfiles/file/79580156259.pdf In PDF document text
    • http://diagcorlifescience.com/attachment/file/pobogozibidawuv.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/sunevix.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/38668020257.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/nifojojularujulosikigase.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/nexikorezel.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/bobogibewufixamipalozo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613272f5371b1---rozudavegigafatuluf.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/4926682622.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/pofeguvixenawire.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/62760274190.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/85006033760.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/36240482494.pdfIn PDF document text
    • http://pasaru.com/upload/files/97262489698.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/vuges.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/16189770834.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/7917173365.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/11916802521.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/84481176180.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/91948381153.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/jenaxonogewi.pdfIn PDF document text
    • http://sieuthibds.net/images/files/55202675039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+be+a+private+number+on+androidPDF 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_off0000b6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F5 16288 bytes
SHA-256: 6a61e5ec756d5358f5d1b56fc3e12c1beb8a048856de7a7d9b9d6cc07c2b6a45
font_01_sfnt_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 10720 bytes
SHA-256: 25b74ad83455c5cab0a85254d2f1a21d6b5683fc8d9840d9c0fd27635e295c22

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