Malicious PDF — malware analysis report

Static analysis result for SHA-256 27541f8af9632641…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 04:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 052f983b7ecf6e218e1be9fc5b704101 SHA-1: aaa3a75d5b309ca64e556aa49b103e3ea8402155 SHA-256: 27541f8af963264110b559e10be10cda6ea12f832a8a704d892afe09fc2c4743
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. Although no scripts were extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to potentially malicious sites, aligning with phishing or scamming tactics. The presence of many unknown reputation URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://divapharma.com/uploaded/file/92725442272.pdf In PDF document text
    • http://sosnovgeo.ru/userfiles/file/tebitovarelerafik.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/86599508846.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/gukogofez.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/44254695591.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/67988954348.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/jagevupisugafemexixibawo.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/kuvubogijumuxowesefugulo.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/94823627588.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/31771521239.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/sapabofezu.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/97723866040.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/gefetetunemategelafedabu.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/koruvexevejono.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/bokikemij.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613362cea8d19---pilotenevokedepu.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/7242919832.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/19631997918.pdfIn PDF document text
    • https://sainaudit.mn/File/23764539388.pdfIn PDF document text
    • http://k1a.ru/images/files/file/65758812225.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/vosamukibibo.pdfIn PDF document text
    • http://orderkai.com/uploads/files/tamokaxukatadusejeneveni.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9tg1m207lkitfcbb4bi16qhplo/rowefuzetusemineb.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/53179824791.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/39625015598.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/95419472074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=galaxy+note+9+genshin+impactPDF 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_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 18208 bytes
SHA-256: c08069395262737bb0af6e3510d2c98c87cb63f11e1903b3f2c6362e5a8ae23b
font_02_sfnt_off00011e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1B 11144 bytes
SHA-256: c57aa77eb38a99c5557bb72a8f84b46c41ccbfb37c8e0fdfe621784e40738a6d