Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb3aff7adec46b6…

MALICIOUS

PDF

70.0 KB Created: 2021-09-09 22:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 7c6cbdf8b6e9abfeb3036c55175a4232 SHA-1: fd52da767d3ee3cda992f49142bb7b50c04333a2 SHA-256: afb3aff7adec46b6341bd2737ce5c852172143ebb91b9c28ac96edc9ba4df2e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or redirection mechanism to external malicious sites. The PDF structure and the presence of external URIs strongly suggest it's used in a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://cructi.ru/uplcv?utm_term=wps+wpa+tester+root PDF link annotation
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613406317faf8---gafemuxofa.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/41567010287.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/goliloponogazud.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/getotep.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/27506305337.pdfIn PDF document text
    • https://palet-school.com/files/files/48720622188.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/36800818125.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/giwejeselojabalaviju.pdfIn PDF document text
    • http://warehousetraining.ie/images/44840908087.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210905140038.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/56198968117.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/52617104248.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/rapitekuvolo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161374ce4c0f32---tifilapa.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/kovare.pdfIn PDF document text
    • http://ilkemymm.com/image/files/18406301633.pdfIn PDF document text
    • http://cssh.es/img/file/ziposefidumur.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/zefowawedivisafibexupape.pdfIn PDF document text
    • http://elsped.hu/files/file/tinurulipowij.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/wolumufufavukabelamu.pdfIn PDF document text
    • http://lukinserv.hu/file/tuzuweluroluma.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/74088736117.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_off0000b414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2B 10080 bytes
SHA-256: 722841924a04e641963ff7cea6b78dc0a4a4c73aa02f826e9945fd760d1430b4
font_02_sfnt_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 15628 bytes
SHA-256: 15cbdff53d8a039af3fbfed3d0c84d3ff8008da39409e5ecf9f46638c68b703a

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