Malicious PDF — malware analysis report

Static analysis result for SHA-256 42865f20c8720ae8…

MALICIOUS

PDF

105.4 KB Created: 2021-03-18 08:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cde5528a85f7c0441ee3107cd31506fd SHA-1: d42e31631352648da36c44cf50682009747b7042 SHA-256: 42865f20c8720ae895f913b73ca9d414dd3724b7dbe360078aace8acd840f2a7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary purpose of directing users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users via web redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=super+mario+bros+2+3ds+walkthrough+world+5+castle
    • http://baramijotafexo.mypressonline.com/99730185358.pdf
    • https://static.s123-cdn-static.com/uploads/4454163/normal_5ff54701beaf0.pdf
    • https://static.s123-cdn-static.com/uploads/4401982/normal_5fc794182fcc1.pdf
    • https://static.s123-cdn-static.com/uploads/4466664/normal_5fcb43968f371.pdf
    • https://static.s123-cdn-static.com/uploads/4500889/normal_5ff62326da411.pdf
    • http://xupokaxe.medianewsonline.com/cashier_training_checklist.pdf
    • https://static.s123-cdn-static.com/uploads/4416790/normal_5fc7e9bd25374.pdf
    • https://cdn-cms.f-static.net/uploads/4481271/normal_60261383c1528.pdf
    • https://cdn-cms.f-static.net/uploads/4475217/normal_603dc023ae4c9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://02aee961-309f-4c8b-9790-08f12c26706e.filesusr.com/ugd/8321db_b89131eaa13e42dd91273cafbc510fb6.pdf?index=true
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_2c159988fc404ff9bc6d726424365b7d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/220b67a4-9feb-469a-a3b8-129a79de0273/hp_laserjet_m1212nf_mfp_52.0_scanner_error.pdf
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_842006660d784314972c719f160bfa01.pdf?index=true
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_88910e7725474573b14c1722dddf68d6.pdf?index=true
    • http://zuputes.atwebpages.com/winidimog.pdf
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_57993ee845d742218430e063dd6246cc.pdf?index=true
    • http://pazepoxi.atwebpages.com/sharp_microwave_smc1662ds_reviews.pdf
    • https://uploads.strikinglycdn.com/files/0fcb9a2a-e2b5-4576-ba59-46a1c13edae8/24_hours_a_day_book_amazon.pdf
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_04c9d15f8a564091ba6f4edbbd031281.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014405.bin
63100a1dc5cba78bb65a99afa318b614ec6f97e50bedd8717363499ae40851eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14405 6308 bytes
font_01_sfnt_off00015958.bin
dacbea2101c0f2398ce7b9536a7025d18d4c38b710f2801afe9f549d59f4d3db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15958 11796 bytes
font_02_sfnt_off0001817b.bin
f260341e2deafef282c0cdf6f9547f7c1575836931e00f2cecf0e77490754097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1817B 16232 bytes

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