Malicious PDF — malware analysis report

Static analysis result for SHA-256 653523d2938718f7…

MALICIOUS

PDF

87.3 KB Created: 2021-09-15 10:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 639035975ac9a961a5e46063dfacbb22 SHA-1: 4d815101010e183ff46db1b5920679fdd970f53f SHA-256: 653523d2938718f794014139a04792ff403082ff7fae5fded2fc8f19732d3128
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or redirection mechanism. The presence of external URI heuristics and the high ML score indicate a strong likelihood of malicious intent, possibly to redirect users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://metabolitplus.ru/files/file/39787677477.pdf In PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161392376286ea---fisaxotowilezifonawe.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/17452976517.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/84522558849.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/zafawesexibezesosu.pdfIn PDF document text
    • http://dfanchem.com/upload/files/10236825320.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/vakozexixafa.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/57910335299.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/loxapezuzorodefe.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/65950469909.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuxovelilupepamifigonujur.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/pujuxemunolalajuxan.pdfIn PDF document text
    • https://datawire.gr/files/files/xedorezik.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/ganitadubo.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/bobixeje.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/logopobudizelagotadepota.pdfIn PDF document text
    • https://mbbs.hr/files/fasojelosisowepegeleruwow.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/tutinubugedawinalewarojo.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/lifeligutumukipupuda.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/fatisidojeg.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/70731188736.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/48824107580.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/rodajugabogoxozugafi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393da6e9f8e---95278193181.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/82473637744.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/gajegeriburatokakefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=send+to+kindle+chrome+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_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 18688 bytes
SHA-256: ddc9fdff80d6bee65f1fdaf9b6de8327ee3cf5cfdaf7dc653b4f7cc54769b9ce
font_01_sfnt_off00011f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001379c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379C 10636 bytes
SHA-256: 66e3377e86df87d83e40ee2c4054b664f3175c4e4c25962d46c55ff1eead2e7a