Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e615a49d7d4d91…

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 15:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac56154aae837170103cf1c1ab02febc SHA-1: d1675a8e73a09f77d53c324861978743e0ef8bed SHA-256: 61e615a49d7d4d9103eef90ef99b1708ec2b6e0ae66000a5fa3258bf7c1ef81e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=ring+size+app+android PDF link annotation
    • http://studiovalecchi.it/userfiles/files/kinajinoduliwor.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/ladij.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/zokilomojoserususip.pdfIn PDF document text
    • http://hk-keber.de/images/file/53203703727.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/75263805075.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613da458e8ae6---veruzefokasexekozidi.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/86578151506.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/mutasi.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/sulegapi.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/77453419946.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/60802144440.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/63579302810.pdfIn PDF document text
    • http://sartor.ru/upload/files/99972524077.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/kowilomagipomamisexun.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/judunegemurej.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/50280497037.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/90748828555.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109110756519127.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/tolavobakori.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/37904646722.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/72756857950.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/82394061755.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613526f4c8f42---penabosexewebubusevuri.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_off0000e8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 10528 bytes
SHA-256: 2571fb88f839f5b97c26a1ba6b54cc54071081fb01a143459ed11064a25898d4
font_01_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001189a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 18388 bytes
SHA-256: 74c3ab35a16d7dcfac11b38be0cd57fd9d464905b14751289a205459586e95fd

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