Malicious PDF — malware analysis report

Static analysis result for SHA-256 366b7ab3d9edf571…

MALICIOUS

PDF

77.1 KB Created: 2021-04-28 10:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0b93b6db583b0e789c94c6676dce3d0 SHA-1: d35550a03c6e1fccea95285bbe0ffadcb21d4013 SHA-256: 366b7ab3d9edf5711cd42ed0911f5b7c933872e09865815d70189b3c98251654
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, directing users to various URLs, one of which is identified as a potential phishing or malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and embedded links suggest an attempt to trick users into visiting a compromised or malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=computer+hardware+and+software+maintenance+notes+pdf
    • https://vubeluzuge.weebly.com/uploads/1/3/4/3/134357782/5169444.pdf
    • https://fivosegexaf.weebly.com/uploads/1/3/2/6/132683078/pinodovudesut_luviro_galadibufev_tunoza.pdf
    • https://cdn-cms.f-static.net/uploads/4393898/normal_605c3a4f84c67.pdf
    • https://kusuxifitumaka.weebly.com/uploads/1/3/4/5/134593182/vegolitaguteji.pdf
    • https://cdn.sqhk.co/pubabolab/MIhhhhZ/best_melody_ringtones_free_download_telugu.pdf
    • https://cdn.sqhk.co/vadetegubufo/Ijdihii/amazon_flex_driver_app_download_uk.pdf
    • https://cdn.sqhk.co/zojoguxuban/ihibhjE/weeds_cast_season_7_episode_4.pdf
    • https://cdn.sqhk.co/zifixanuk/adieaij/rapomanawebo.pdf
    • https://cdn-cms.f-static.net/uploads/4417129/normal_5fdb58e22befd.pdf
    • https://cdn-cms.f-static.net/uploads/4506131/normal_60185c9f8c9ab.pdf
    • https://static.s123-cdn-static.com/uploads/4501980/normal_5fdf11b8f3c90.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://165b0ab0-89c3-4517-b88f-e2bd0c55d975.filesusr.com/ugd/97b555_e4d44bd25e0d4b5387b3d62c2e16fabb.pdf?index=true
    • https://s3.amazonaws.com/jaxesabi/jezitajurujofobomarofus.pdf
    • https://s3.amazonaws.com/rorives/78921178908.pdf
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_e014e4c77b0e49f08f922926c8052e40.pdf?index=true
    • http://bulufuw.rf.gd/dragon_mania_legends_breeding_guide.pdf
    • http://xitevesapa.epizy.com/99436588631.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_off0000f0e0.bin
84c5d027e65a0f747d71a628f72fd5acb117cbe988d708c7573ee0f44e319aa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 5360 bytes
font_01_sfnt_off000102fc.bin
cb42fecc5a37f4a9ce4512635dbafda88371b61a1bf497e99aeb25423b41ab40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 10468 bytes

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