Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53cf9a69f60fe47…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 22:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0005e9c4b15e7aa6bf29d825cb0ce33a SHA-1: 7d103ac3b307210cb8f35b0ee20d6191cc2532eb SHA-256: d53cf9a69f60fe47586dbbc9f44687798f5dfb1849921c80313870681641df52
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to disposable hosting, characteristic of a link farm used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=tales+from+the+far+side PDF link annotation
    • http://veitali.com/upload/files/voboxux.pdfIn PDF document text
    • http://staropolski.net/Upload/file/nedozanop.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/42435591180.pdfIn PDF document text
    • http://eternoohydro.com/d/files/lugozonuruzoboferokasife.pdfIn PDF document text
    • http://weingut-suppan.at/files/tuwepibesoli.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/zivojurifojofitebejikeran.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/94796144167.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/nolanoluputela.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/46462556370.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f6222be0f736fe46fcb7978c5858f788/61094980068.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/nalukudorixowibiwix.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/66732070017.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/94480458615.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/18797495984.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/40379022090.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/50980874742.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/43878302577.pdfIn PDF document text
    • https://kor.mycultureis.com/FileData/ckfinder/files/20210923_B2BE920F2F90C81D.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/56649055539.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/lakerexufukof.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/83496314431.pdfIn PDF document text
    • https://activepymes.com/pub/file/razebikivukobiruwidape.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f9be3b1a399d0f2e3abb8e5cba85e1ff/46328801953.pdfIn PDF document text
    • https://aleemanschools.org/userfiles/file/sevoxu.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_off0000af11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF11 15616 bytes
SHA-256: 607d50dd6a184781bbd2017e38cab82eff4dcf9821a5bc4ca9bddcfe0a3ea520
font_01_sfnt_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 10476 bytes
SHA-256: 3a5d4ef40c52b17db97adb8e131735a38b3cc2b985ee14e381298fa4f75b5446
font_02_sfnt_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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