Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc2dfd207661e86…

MALICIOUS

PDF

67.2 KB Created: 2021-09-20 18:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c1ab654161ceb5edb01fad1d539e82db SHA-1: 82b435b9cc61b25111430a32302b220f34a223ae SHA-256: edc2dfd207661e8617c2f88765beb760e0760454a33fe84809822722fefbf026
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pistant.ru/uplcv?utm_term=remote+1+frp+download PDF link annotation
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/gigevutozimunokerogazenaw.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/62522145702.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631433875.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/susexixevozuzigiwut.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/biwiwowuwofebabexarezi.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210907054714.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/20916361123.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/10585385402.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/63535531169.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/pugobomiditesidenakefal.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146eb6b84c3d---15433750651.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/25823363001.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/zelasemajojar.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/burijabaduxuxogedazina.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/bapaju.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/28270314643.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a83c5d2c615c5a2ca388c483b163f73c/rokun.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/69425702056.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/93435828877.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/8392755154.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_off0000aba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABA6 14244 bytes
SHA-256: a955866f93d648b46549fd35539e3c79a141b6fb15250f253c9e871f87207575
font_01_sfnt_off0000cf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 10584 bytes
SHA-256: e7ba71675142cccc5ac888bb61ebaa25268395297ad8b4e9bc5bdfe2549ac9b5

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