Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8876edb8907eb33…

MALICIOUS

PDF

71.1 KB Created: 2021-09-16 17:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 452cbb21c496347d6bc510f9de0bd0c5 SHA-1: a70efbe73367a4512731d35517dc079cdb7b405f SHA-256: a8876edb8907eb33baa30a1749aacb024880724cc77f0051bbedc7d1eb8d8224
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a large number of links pointing to disposable hosting, reinforcing the phishing or malware distribution intent. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=hnc+sport+live+tv+for+pc PDF link annotation
    • http://vanillasky-ch.com/images/files/95832830211.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/jokadibupegifixifit.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/9203438571.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/sojokukagevabarugepifa.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b8b536051fe75cd6b16493ddc1fd9de3/zapovamejobi.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/jeduveribogaxelukowir.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/8671001141.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/tadijesojozodopufe.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/sibula.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zuwava.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/57420067961.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/fukasajinijivijikejaxip.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/kavujemavetapadodo.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/sudimipolib.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/rebodira.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/85998376807.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/84273583994.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/bawuvasi.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/kanojorufira.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/22896206431.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/gewetisujed.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/51929598582.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/21437945191.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_off0000b654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB654 10368 bytes
SHA-256: 4b3dd3f597cdce37384020a3b873a7a686abe64a1ca5b801b6d80df021f91373
font_01_sfnt_off0000cdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EC 15916 bytes
SHA-256: 156855c9970ad5c174bb29933379d3808d709f02aacfda3b27a8e657d19e8d45

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