Malicious PDF — malware analysis report

Static analysis result for SHA-256 c062f24d1d86ad86…

MALICIOUS

PDF

68.9 KB Created: 2021-09-19 11:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8f2c3461a0376f07569fa0bc6ceb96a SHA-1: 09fbd43bfc5069e7ca9eb46ed30e205f1fcbfa0a SHA-256: c062f24d1d86ad862059092917e8099c90d20aed5c8df52e365824972d684b6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm with multiple disposable URLs, and one URL specifically mentions 'android+store+download', suggesting a phishing or malware lure. Although no scripts were extracted, the PDF structure and URL patterns are consistent with phishing campaigns aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/df650d0d747cecf3d7e4ae70ab2b6238/32369186431.pdf In PDF document text
    • http://yuilchem.com/userData/board/file/koselinewisavivuges.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/86974568953.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/34891544851.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/36167909776.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/mezom.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/zufigozevizifutifole.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/xatosogedinopotedidoje.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/futugatodewo.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/49316242853.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/16862223713.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/46598147648.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/67055621546.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/70514866857.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/99107796490.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/lilabepolesogukevenefabob.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/8486777834.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329ce2818b0---turepadabebuk.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/fowaxipefulowufe.pdfIn PDF document text
    • http://chipgene.com/image/files/20210910_150836.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/buruvidakatotizuzuve.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/bonunefepamonowikidimiw.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/83085120232.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/livewedavikerowi.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/digalajixagigijazizemil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+store+downloadPDF 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_off0000b284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB284 10308 bytes
SHA-256: 2477cb699e630d654025983371ea8797f4a5d624693ae3f015a45ca268bb8f1e
font_01_sfnt_off0000c9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 14316 bytes
SHA-256: 7bc4796300db3611d4fd28930bd29bd803a06d63807604b637e356bc6e36c345