Malicious PDF — malware analysis report

Static analysis result for SHA-256 305eba0a718afdf5…

MALICIOUS

PDF

78.9 KB Created: 2021-01-09 15:27:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4f094dcea82b79e9e9779673241f1ddf SHA-1: 75ccae2755ce19b4507989663d890ed0fcee7791 SHA-256: 305eba0a718afdf5e78891efc41638465a593d20227181abf58b1b089d090a0a
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to redirector services and link farms, indicating a phishing or malware distribution attempt. The heuristic firings confirm the presence of malicious redirector links and a link farm, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the structure suggests potential for embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffmen.ru/123?utm_term=shinryu+guide+ffxiv In PDF document text
    • https://cdn.sqhk.co/lakuziwi/zRhccia/vujakoxipupevo.pdfIn PDF document text
    • https://cdn.sqhk.co/japexexuko/r6UuGhd/270608350.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/hfZUgf2/missile_defense_advocacy_alliance_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/dolubivo/0Qib4hb/how_to_write_a_business_plan_format.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/samesuseliju.pdfIn PDF document text
    • https://cdn.sqhk.co/gisusisabez/hijh9jj/gejelobenerutolotut.pdfIn PDF document text
    • https://cdn.sqhk.co/jawezumate/zZChhgf/tophatter_fun_deals_shopping_offers_savings.pdfIn PDF document text
    • https://zanewodibamejat.weebly.com/uploads/1/3/0/9/130969445/11f8245fddd8bf.pdfIn PDF document text
    • https://dujezipiver.weebly.com/uploads/1/3/4/6/134610991/fdda9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/13577431089.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/74757105272.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EA 3444 bytes
SHA-256: 39e2be05705e06969f8590b77db48ad94508a43ad7787d15e4ec1cc71640ec32
font_01_sfnt_off0000e015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 5084 bytes
SHA-256: dd9307889b3dc12b83b2178ef2aa26fb1259d438cdea485ffe69101e8ef9dc4d
font_02_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 12676 bytes
SHA-256: e65db348b1b9a14369272780ccc3ac42dd992cc466e08f9e4d39edc64a54fde1
font_03_sfnt_off00011986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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