Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d54c2d3e9bce08…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 04:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb585f0d2f0ec7bb05a3711b50e88de9 SHA-1: 86de49fc597c53a78777eac998781d51842da176 SHA-256: 12d54c2d3e9bce0874bd0159aa41ac0642ad2a95f468f243cf6112e76a5427b2
126 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. The heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites or downloads. The presence of multiple unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mai-colle.jp/userfiles/file/17515712699.pdf In PDF document text
    • http://www.farmaciabergua.com/userfiles/files/noxosirefetaveje.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/sefefewo.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/16239854840.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/zabiredasipudeje.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/31808588577.pdfIn PDF document text
    • https://egf.tw/test2/images/file/vevofujolubiver.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/betexalesi.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/26062997091.pdfIn PDF document text
    • http://koutingchina.com/upload/files/52854739266.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/79924970091.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/99396300136.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/65497325524.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/kikogi.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/wilirisetitikabapexutigo.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/muxipe.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/27946448292.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/69287415519.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/nujikifexurazubag.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/mebodugeniliruxubumite.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/51867610699.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/tejekifazetixin.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/89209857578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=hay+day+download+mod+apkPDF 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_off0000cec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC0 10244 bytes
SHA-256: 72e43fbae1ddf2782827981fe494d361c542553045f7662f1f20a0eeb20e5d58
font_01_sfnt_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 24300 bytes
SHA-256: 80dfc585f2831150c32c5f06e55ffad8e98d71095647e27b065a59088578c25b
font_02_sfnt_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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