Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd5780dbce982c6…

MALICIOUS

PDF

127.0 KB Created: 2021-09-21 07:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1597a32538e7638319c07542c7a618c SHA-1: e180b71c92a47a5f38ce9e6360be391cd6d5222a SHA-256: acd5780dbce982c6059b55f49a1bbb16702e76eb592ad0b89aa3c0449aa61e5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, with one specifically noted as a link farm on disposable hosting. The PDF structure and embedded URIs suggest it's intended to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://smidgel.ru/uplcv?utm_term=switched+at+birth+script PDF link annotation
    • http://jobsandhi.com/uploaded_files/userfiles/files/lofez.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/duvejedalejenede.pdfIn PDF document text
    • http://exim5.hu/_user/file/93439440027.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/sebivob.pdfIn PDF document text
    • https://jensbrode.de/files/file/15383468683.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/vurepazat.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/nigorulitukuzasowiketi.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/wugubijidepedidimikufi.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/dabezuwesipigiv.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/mabojuxo.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/tuwedoporupik.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/81868659398.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/pupaveponogib.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/9034cb37ed039240c78a658a6b3fa359/sinibotapudamosa.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/sonadisizijelipokige.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/jukisigis.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/5638394408.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/85705629360.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/16853253238.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/15502321436.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614507e532f5c---70880533532.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/winusugata.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/tolopaxexoli.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_off00018cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CBF 18992 bytes
SHA-256: c90d559298440f67f84bd29fdc09f7b52371d53b56579b57b7f651022e1bd38b
font_01_sfnt_off0001bd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD32 10640 bytes
SHA-256: 1c13d489cae65a2f7450adec2f8289c035d58237b93d908e995e68ca3ce00404
font_02_sfnt_off0001d582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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