Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d70a91d725002d7…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 13:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c6f2a534443d2cf2d8effad75145363 SHA-1: cd7b65776551bfc92c1c5fe95d411e571e9b2745 SHA-256: 1d70a91d725002d72663506d84caba7b628f9458f124c2fe3e1508d4a5e6529e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. ClamAV and ML classifiers also flagged this file as malicious, reinforcing the assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 https://allytemp.ru/uplcv?utm_term=ios+telegram+for+android+apk
    • http://duhochoangthanh.com/upload/files/48799933763.pdf
    • https://biocoils.com/img/file/viditaforurabobuwomarizon.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/82611284344.pdf
    • https://dunaweb.co/bg_image/files/milunuzeturozixigubaf.pdf
    • http://hastensandbreakfast.nl/userfiles/file/xasavikikaru.pdf
    • https://sunkamalzemecilik.com/userfiles/file/24827756998.pdf
    • http://officegate.biz/admin/fck_upload/file/98992773392.pdf
    • https://iwanbim.iwan.co/userfiles/files/87678990406.pdf
    • http://perlawarmii.pl/userfiles/file/58349097839.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ccb757052802f4cfaba04c4a87ec58a8/ketedipoxipemarogovid.pdf
    • https://thietbixanh.net/uploads/files/batidajonolorewovebun.pdf
    • http://moscowballet.ru/userfiles/file/kedudafut.pdf
    • https://vegas-shop.net/uploads/files/woxodowowixuzatokepogi.pdf
    • https://tortugafilms.ca/adminfiles/file/60068804941.pdf
    • http://airmon.hu/images/files/85977433671.pdf
    • https://didaktika.drmix.cz/uploads/files/55316666601.pdf
    • http://24horasnoar.com.br/ckfinder/userfiles/files/dofujizotetusote.pdf
    • http://maulich.vn/attachment/files/zitilikilaminukinugu.pdf
    • http://metisentry.net/ckfinder/userfiles/files/morazarimatawizetu.pdf
    • http://olympusflights.com/files/files/vigomuridasunobotamenete.pdf
    • https://gamepinleri.com/calisma2/files/uploads/28636950053.pdf
    • http://hoclaixebinhthuan.com/upload/contentFile/file/namokorepi.pdf
    • http://bilcafe.it/userfiles/file/70447305035.pdf
    • https://loctra.net/userfiles/file/95715303345.pdf
    • https://svingenieria.cl/userfiles/file/14907231067.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e340.bin
f53aa8dfb425c52baf861853ea372fc7da78285938230247b95f7d2de1d732fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 18648 bytes
font_01_sfnt_off00011372.bin
0050fe119af877f77c0bc9064ebf1bede52db640190629222a271c4107ec271e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11372 10884 bytes
font_02_sfnt_off00012c61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 16792 bytes

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