Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c4ccaecf8db7d7…

MALICIOUS

PDF

69.5 KB Created: 2021-02-05 03:11:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 0e55ce30c8c6dc59756b5e650b74eb2c SHA-1: bb61ec9dc1c9cb56f403c597b4044b162e584165 SHA-256: 55c4ccaecf8db7d72e2db7085cf6439c546fbffa3b55a8ad02ff94086e943969
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?utm_term=geography+quizzes+for+adults+with+answers In PDF document text
    • http://dilomevoje.22web.org/58119727514.pdfIn PDF document text
    • https://cdn.sqhk.co/vaziworab/09hjEjj/super_dragon_stickman_battle_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/5cTdOCj/modern_european_history_textbook.pdfIn PDF document text
    • https://jekufagiz.weebly.com/uploads/1/3/0/7/130739150/8e0bf32.pdfIn PDF document text
    • http://satofaxa.iblogger.org/64132876982.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/IMjjTJF/amazing_world_gumball_games.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/gjfic81/rescue_cute_boy_and_girl_game_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/jb8mjhV/mekuresubosixuvafofor.pdfIn PDF document text
    • http://soguged.22web.org/97801117139.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/ejjhasV/hide_n_seek_bakersfield.pdfIn PDF document text
    • https://cdn.sqhk.co/julukimesof/3if9ggk/mirror_palais_clothing.pdfIn PDF document text
    • https://cdn.sqhk.co/duloputemab/jTjhid9/funniest_grumpy_cat_memes_clean.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/kizugokofo/fizerekipobufogedimuxulor.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/10560490801.pdfIn PDF document text
    • http://firuneta.rf.gd/58854281829.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F9 5704 bytes
SHA-256: 4b02b2473747fb642504e337809b80c6491c98cc190c806e8756360cf7176595
font_01_sfnt_off0000e57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57F 10400 bytes
SHA-256: 8ae58b82fe1e301ef2b6d3397a8675e754643b8d79fc8e4f7896d318ff852475

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