Malicious PDF — malware analysis report

Static analysis result for SHA-256 2091130c3b723dc4…

MALICIOUS

PDF

72.2 KB Created: 2021-02-12 20:37:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ef00c4d60cce065f132ab8e10de4d657 SHA-1: ba501b5a0486995b008267f9f3fa8ebefd78353c SHA-256: 2091130c3b723dc419c6424969a93112aab64ad8ae0562063af5556ea8381ecb
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=salt+symbol+tattoo'. This URL is likely used to lure the user to a phishing site or to download a secondary payload. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious purposes, likely phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/wix?keyword=salt+symbol+tattoo In PDF document text
    • https://static.s123-cdn-static.com/uploads/4390660/normal_5feb49db8bd5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_600aaf200bd87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_5fe91130a281f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369794/normal_5ffed0502f35c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393752/normal_5fc5c3b31ed61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401714/normal_601eed5d15786.pdfIn PDF document text
    • http://123dutch.com/the_pursuit_of_happiness_full_movie_watch_onliner2ql8.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/f3ichdq/can_t_write_notes_on_iphone.pdfIn PDF document text
    • http://reduslim-shopofficial.site/finney_demana_waits_kennedy_calculus_answers3jcsy.pdfIn PDF document text
    • http://kinoxca.xyz/bible_tagalog_file57jqn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416319/normal_600dbef117e28.pdfIn PDF document text
    • http://remont-pc.website/25392003384u8bg7.pdfIn PDF document text
    • http://disconto50.pro/33778517704a699i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384154/normal_600446c721495.pdfIn PDF document text
    • http://frasqen.online/beale_street_music_festival_2019_performersdmexn.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/wujodibu/73077913889.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/animate_cc_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/novixusobela.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_off0000d527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD527 5080 bytes
SHA-256: 7cea05dcb58a3ff1ce28b20d5778c6c7cb16e511467e4c43a0b51a2d94ef0bff
font_01_sfnt_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 1880 bytes
SHA-256: 4d8699bd7527bc0d9365cb01bf7fc3d8fdab123ed33e39f1ad1ae9c91ffa025c
font_02_sfnt_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 10688 bytes
SHA-256: b2c9b4676b24f08a5fc5e17afb0e29daccb5aecd9ac6cf117c2fb6887a2ae4fe

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