Malicious PDF — malware analysis report

Static analysis result for SHA-256 6484bd42f040ce4d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 06:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 85f47795077f39477da77f644b3162ac SHA-1: 96bec924056d018dec0e0d2e50e3d516812420dd SHA-256: 6484bd42f040ce4d6814ea10247d6b31f7cc621ff83d052bd2402e46ccb37818
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URIs, many pointing to disposable domains, indicating a link farm or redirection infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=erik+anders+lang+sia PDF link annotation
    • https://yukkumpulgroup2.com/contents/files/tatokugivuzasurit.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210912064642_aupx13.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/bipifedojonevorarabevofev.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/zasuvovetafuva.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/davukar.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/raluxujuxibabew.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/6922888105.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/vefosolifigoto.pdfIn PDF document text
    • http://mqskin.com/luutru/files/vejunarusuzumusavi.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630728633_05f94d56ca.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091020362873499.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/780607b61faa5452193411c4b887a312/97823189586.pdfIn PDF document text
    • http://analhospital.net/file/files/48166527211.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/89904015660.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/dqh98q047h5iu4hmsu7fp46feo/41011691988.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/8940348286.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/poromog.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/31641235213.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/zuvodavorixugavu.pdfIn PDF document text
    • https://sadex.pl/fck/file/27945682493.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_off0000d94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 10280 bytes
SHA-256: ab47a09cd51ba6d6f6bd389ca826ffa5f406522ba8da407548c16785319a98c1
font_01_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 17172 bytes
SHA-256: c03baa95d7479b851cb60996d07d8c22d0bd1ffc3e864bc9abc31079f6f3de4d
font_02_sfnt_off00011d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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