Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d28168654b16ec…

MALICIOUS

PDF

70.8 KB Created: 2021-09-24 21:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b45980a052a3e0ca9c58064956336135 SHA-1: 9dd62494a897fa31bbaae03a22b03196715e16e5 SHA-256: e7d28168654b16ecc09afdcfc1787d5871c0907069bf38e34acbaf48c4f0493c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded URIs, with several pointing to potentially disposable domains and one directly to an IP address, indicating a link farm designed to redirect users. The presence of numerous links suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://twtqedu.com/userData/ebizro_board/file/fexojurimifog.pdf In PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/36748886383.pdfIn PDF document text
    • http://onelove.cz/file/21618239362.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/30729537415.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/35115828833.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/21131680108.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/86608315650.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210915_145545.pdfPDF link annotation
    • http://www.yemany.com/yemfiles/files/4753904916.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/50913366684.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/62e5314ed7d3558bb514e57630f4d594/kavupedipabivilibaxe.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/vesonomejezuwajafan.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210923011005.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/39249875234.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/vakoje.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/ziken.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82636587873.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0984913001631166714.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/5215176481.pdfIn PDF document text
    • http://eternaseguros.net/files/files/56594648630.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/64648902104.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/pevofikubapivow.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/zonewixe.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109060030138893.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/21992793096.pdfIn PDF document text
    • http://autokaryszczecin.pl/userfiles/file/zodukabegiwezase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+offline+multiplayer+fighting+games+for+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_off0000b21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21E 16248 bytes
SHA-256: 632946961d6bf3bc42b483d5e9a720fbaba23143cf927ffa63417340f2b08d82
font_01_sfnt_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 11212 bytes
SHA-256: 79ce35cd10ed38b6bac3860ad9f6914ab8da6c31873d7f7e16d629dec0fb5992