Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ce9ab53a239a3c…

MALICIOUS

PDF

71.1 KB Created: 2021-06-07 16:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82123eef5f050456db546918031acd89 SHA-1: 7b348a5b97c1e99c736eefe2a2560a902378b32d SHA-256: 16ce9ab53a239a3c2b9124d245ee1457c2b40c118f09166f20fccaf3f2139e96
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious phishing content. It contains a large number of external links, indicating a link farm strategy. The embedded URLs suggest an attempt to redirect users to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/pbw?utm_term=what+is+negative+goodwill+in+accounting
    • https://lulapusorifat.weebly.com/uploads/1/3/1/4/131436971/vezepewakikima-rezelularive.pdf
    • https://logazimakopaw.weebly.com/uploads/1/3/4/3/134399250/533570.pdf
    • https://lexabebuwapo.weebly.com/uploads/1/3/1/3/131383838/kupuwosopifine.pdf
    • https://cdn-cms.f-static.net/uploads/4408866/normal_600dd9f3b22ae.pdf
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/2712e74b00f5174.pdf
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fe6d5fec3ba7.pdf
    • https://static.s123-cdn-static.com/uploads/4369769/normal_6001dd323160f.pdf
    • https://static.s123-cdn-static-d.com/uploads/4377704/normal_60b1cbd0e40f6.pdf
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/898342.pdf
    • https://tijisikazodiz.weebly.com/uploads/1/3/4/6/134666015/sezop.pdf
    • https://tupinikuwexopej.weebly.com/uploads/1/3/1/0/131070806/7638053.pdf
    • https://jukekusam.weebly.com/uploads/1/3/4/6/134651272/eebd86.pdf
    • https://fidejilajusaxe.weebly.com/uploads/1/3/4/3/134363993/jilegafoxox-soxuze-nevob-sonuzimerudowof.pdf
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/riduweda-zujadujegarev-mosisilogi-nerivoj.pdf
    • https://zawoluzowusemad.weebly.com/uploads/1/3/4/6/134697528/wawesog.pdf
    • https://static.s123-cdn-static.com/uploads/4485929/normal_60017d84060fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sazupamufode.pbworks.com/w/file/fetch/144590469/how_fast_do_you_lose_weight_on_bright_line_eating.pdf
    • http://tekitejug.pbworks.com/w/file/fetch/144670896/when_is_miraculous_ladybug_season_4_coming_out_in_the_usa.pdf
    • http://detomipipu.pbworks.com/w/file/fetch/144519579/buwomibamaviba.pdf
    • http://foxobekizax.pbworks.com/f/sefune.pdf
    • http://natizasex.pbworks.com/f/golf_buddy_voice_2_charging_instructions.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d865.bin
a0ffac78a85d3525dc3f4d4b2828b156f696816a51afd8ca3229772f1357ce4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD865 5268 bytes
font_01_sfnt_off0000ea70.bin
1fabbc0a744fa58f2589791881c6fe94d56ab600c4efb1254c4f7505ed8e8e87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 10712 bytes

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