Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91ca76df4b03557…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 10:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eef595e0131e43927ea973515f239af3 SHA-1: 01304b3d497598695939a994479f94de7e86cce0 SHA-256: f91ca76df4b0355760dcc0f6808b9922170c93aa40e412c35c7299e4b6c79e86
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host a large number of links on disposable domains, strongly suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crewmak.ru/uplcv?utm_term=preposition+sentences+with+answers PDF link annotation
    • http://gsmontaggi.it/userfiles/files/fidaguzebobibofexebakoke.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/79465252549.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/28230982192.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/jelorasajalarusibazoxi.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/92612598086.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16157454aab6a1---56990055508.pdfIn PDF document text
    • https://maviet.vn/upload/files/jewugipovuvi.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/18120183963.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/61581032392.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/48311117977.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210918034545.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210904160716.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/13791821428.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/53272748575.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613522d415bbd---95424077197.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/pemunazululixi.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/8334612797.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/tisamapuwuvolenidavu.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/lufebetafuv.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/1853871580.pdfIn PDF document text
    • http://zl369.net/userfiles/file/98939036108.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/96262971275.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_off0000b1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C7 16716 bytes
SHA-256: 7f9133cb05ed19b1368cb44150f44ec91f0320d3f744601747ae62cf5f2dcf84
font_01_sfnt_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 10512 bytes
SHA-256: 8cdf3ce047da8dbe7528f69bf94687e444c17d6d288e7ea70a52bc8ce3736318

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