Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4990344befef82…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 05:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cf28bb53c1b446511c6526c8a2186355 SHA-1: 3cc38521f97f609e3573b144ae163d98f2fe891f SHA-256: 4a4990344befef823bd6bf8b92b7080f6dad4930fd504d0671491f42bc14a724
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to unknown domains, indicating a potential phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on disposable domains. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ana-jsc.com/upload/files/39035524630.pdf In PDF document text
    • http://headrepublic.pl/images/files/10976563358.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/fivuxol.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/lobegesoroket.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/gadovukasozojukesadine.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/putirig.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/wavobiniputis.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/mazomobuninosebokow.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/78584120734.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/108708025461351268438d4.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/xanewixusasas.pdfIn PDF document text
    • http://agilesolutions.in/uploads/sijukeso.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/70793425748.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/55303410629.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/merenibavanosenetupowo.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/rofukipofebupatod.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///zimejudafikazidovav.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/98036027915.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db25f7d832---dovatowalakupobujo.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/21949142518.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/12582547211.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/16841621511.pdfIn PDF document text
    • http://totoumi.jp/upload/file/57942674446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=newt+maze+runner+deathPDF 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_off0000d18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18B 10312 bytes
SHA-256: e74a8aad67d2a82f4c1d171ee8d797683655c2e8b724443e76e35471d3eb01a1
font_01_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 17548 bytes
SHA-256: 4c6e9910c1a71266478a759cc3b46f1f7eb8caa0aef0b0be58ae32cedc6ff10a
font_02_sfnt_off000115f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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