Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d491cbc87d80102…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 10:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa0112e65ec24e9808dd073925b49000 SHA-1: 431334f0842179cc181aaf27d61f78c4a94191bc SHA-256: 0d491cbc87d80102f0d534d9fbe516ad27657c942f3d4849801dd30a80c991db
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV detection, indicating malicious intent. It contains numerous external links, suggesting it acts as a gateway to other malicious sites or downloads. The presence of a 'download button' lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=background+eraser+mod+apk PDF link annotation
    • http://jncs.kr/page_data/file/20210904053505.pdfIn PDF document text
    • http://air-con.ru/upload/files/58918091431.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/podomup.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/kesezilolapunuli.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/87523322206.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/putibomiletowavilobajenir.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/vojebilaba.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210908012024.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/ravati.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/71322362373.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/ratusipisupow.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383f58d4621---miwamew.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/99153164042.pdfIn PDF document text
    • http://deforma.it/userfiles/files/lezezelagebepan.pdfIn PDF document text
    • https://ms01bet.com/contents/files/jolilapimo.pdfIn PDF document text
    • http://rurisnet.org/images/file/vozav.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/89959401560.pdfIn PDF document text
    • https://pellevah.com/upload/files/nepopefuxuvesi.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/jugimipinaroloxebigupegu.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/48634653074.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210908_1F011709B18FEDA0.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/33238820498.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_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 17608 bytes
SHA-256: 910781b8eb7474d234b88e45863f68b524391a943beffaa28c251c6b33ec3427
font_02_sfnt_off00011f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4D 10868 bytes
SHA-256: 80270e56a1f8c20575cb57c731290eeb6ceb8688934c264e540563acd2c715e2

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