Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70c8b57d8d73513…

MALICIOUS

PDF

75.5 KB Created: 2021-09-25 10:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7061db785d36bd839d7c4103fb695850 SHA-1: eed393eaf1a4537e247670fbc3c74e964120c89e SHA-256: a70c8b57d8d73513f983522d4ad876e22a56a2c611f47c2c954be211bc26668d
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. The PDF contains numerous embedded URLs, many of which point to potentially malicious or suspicious domains, suggesting it functions as a link farm to lure users to phishing or malware sites. While no scripts were explicitly extracted, the PDF structure and the presence of many external links are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://mallarpurnaisuva.org/go/file/65682199747.pdf In PDF document text
    • http://dragonspond.com/uploads/files/sitebaxupajujiwasupavu.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/xezes.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/75671ff1114017540e189c4deec84b4f/19608845298.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/sakabuxonep.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/gibevogusizujosowubaz.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/kugezafexofigafisux.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/52974757437.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/vurasexufuvuv.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/xubit.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/ziluvatibuzinozalaxesata.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135db59f2dae---94438045699.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/rozode.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/pasobigawewo.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/11113396962.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/89602017289.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/rogebakakug.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/89042121095.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/87029898762.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/wetifarivetumejij.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/wixeserupinozo.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/21502261722.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/15158077973.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/dilanetuvogozas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=watch+kingsman+online+123moviesPDF 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_off0000bbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEB 11072 bytes
SHA-256: 795a37df6cfacd12c68b30d628b2ca745879d48c0f839b0b68c27e7109c0aaaf
font_01_sfnt_off0000d5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 19096 bytes
SHA-256: 96a86d09a9c6023360e88327d7800d5b3cbba250542af644f878f8fafa0a4c86