Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39dadd45dddbd79…

MALICIOUS

PDF

86.1 KB Created: 2021-09-15 15:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 071001e4578a3e988193ccfbc4f54d92 SHA-1: 9d9c182fe58dfb4b348290ad9c0b056e02decba9 SHA-256: a39dadd45dddbd79868b569688280eb34d82fdda92d92f40850be6e3565d8226
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The presence of numerous external URIs, many pointing to disposable hosting and acting as a link farm, suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://catamma.ru/uplcv?utm_term=land+features+map PDF link annotation
    • https://electroagro.es/pub/files/99815073744.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/motodejerodadaj.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/botovovakis.pdfIn PDF document text
    • http://specimport.by/files/files/9081220218.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/68126730998.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/33098347378.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/66718299731.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/watunar.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/kosetoxuwuzotuzut.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2a47da87a---xakadenugu.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/rufonusigafiz.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/molaj.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613554dc850ea---fafujewedewiwupo.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/biwijevifegir.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/32796697678.pdfIn PDF document text
    • http://lawngo.net/fckfiles/nufegosunidevaki.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/pagegeju.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/85082086820.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/ruxosuxunexeniriparokofi.pdfIn PDF document text
    • https://khanikango.in/file/81481160771.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/zabiwivekowezasise.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_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 16864 bytes
SHA-256: aa243141ef2d74adcf22ca0d3763bc7fdd4b4b107f27514fa7cfa312ea978fee
font_02_sfnt_off00013362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13362 10460 bytes
SHA-256: 117e3ab80127fbb81faba0c8477570ca5547072d6897d86f745beab72d0fa5f6

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