Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd327a03073ed948…

MALICIOUS

PDF

73.0 KB Created: 2021-02-19 06:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d2e373e9622cfa758d58c186404a07cd SHA-1: cd7665be603006fdc6f694fedde9c9daaade9b3b SHA-256: bd327a03073ed9483909a8de1dd14e069a506286e793dd442918e9acb73a1db2
214 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical finding of a PDF redirector link to 'yafferge.ru' and a PDF link farm. The ML classifier also strongly flagged the document. The presence of numerous external PDF links, many pointing to unknown or potentially malicious domains, indicates an attempt to direct users to harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/123?utm_term=what+is+ironic+about+the+poem+ozymandias In PDF document text
    • http://gnoogle.site/kt_tape_tennis_elbowwclr8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403938/normal_5ff56b08b580c.pdfIn PDF document text
    • https://suzuxagutif.weebly.com/uploads/1/3/4/3/134352905/1455259.pdfIn PDF document text
    • http://50offshop.pro/let_us_c_yashwant_kanetkar_solutions0not8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450889/normal_5ff247d78cbbd.pdfIn PDF document text
    • http://the-glow.ru/jai_jai_narayan_narayan_hari_hari_mpekk8l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_601c05ec61537.pdfIn PDF document text
    • http://vitalia-transports.com/wemipenotujumorezatij9moub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391954/normal_5fddccfed32ce.pdfIn PDF document text
    • http://zespodsvetkoy.site/escape_room_answer_level_107hechu.pdfIn PDF document text
    • http://robolab.one/school_of_dragons_monstrous_nightmare_on_firekk0b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401517/normal_5fe40080afa5c.pdfIn PDF document text
    • http://homebig.space/756917681626p8dt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gudukupir/posiflex_cash_drawer_cr_4000_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/kobidurokuwosixak.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD356 5468 bytes
SHA-256: b6232485ca25701c71a4f198f659a937fc943c43ce573bb6b7f5e1d01f1fb148
font_01_sfnt_off0000e5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 10272 bytes
SHA-256: 424a40d4d4e0b84aade9be61f8d1a07e8c9cffe7f07b4a1b0b3a3c1cbef7c622
font_02_sfnt_off000108fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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