Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18c6bd0ed722e6c…

MALICIOUS

PDF

70.6 KB Created: 2021-02-27 19:10:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb6d1bb27a10ed530eb2cd14560206d6 SHA-1: 2acd7e40996a31c07195a8821a00bb055a17ed58 SHA-256: d18c6bd0ed722e6c60e0e1412ab03c931693878d26ebe928fa52f1e6bdd309e6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The presence of the URL 'https://dafemum.ru/wix?keyword=who+am+i+worksheet+pdf' indicates a lure to a site that may host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=who+am+i+worksheet+pdf
    • http://rivozuzeno.mywebcommunity.org/guranovilavononowe.pdf
    • http://fukerijinexin.mygamesonline.org/30875819173.pdf
    • https://cdn.sqhk.co/zanivuwiduvo/whewifY/super_fast_browser_2019_apk.pdf
    • https://cdn.sqhk.co/mivijigonof/Biiibig/msr_pocket_rocket_stove_kit_amazon.pdf
    • http://dodemul.mygamesonline.org/multiple_streams_of_income_ideas_2021.pdf
    • https://cdn.sqhk.co/pazakazagoz/QDH3hh9/picsart_photo_editor_apk_download_uptodown.pdf
    • https://wanowozuvigamo.weebly.com/uploads/1/3/0/7/130738859/pipipixugenewaruwemi.pdf
    • http://zobotalemogi.sportsontheweb.net/air_hogs_millennium_falcon_xl_charger_cord.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jikopot/video_er_professional_extension_for_chrome.pdf
    • https://s3.amazonaws.com/pafexegud/baixar_creator_baixaki.pdf
    • https://s3.amazonaws.com/zunewidimem/nezutekuxudiw.pdf
    • https://s3.amazonaws.com/fejenijovekozu/5004526888.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_off0000d8bc.bin
e0cca117d81cc74d8bba549952329a240da5e5e4fef4f413f318caf4b803c05f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 5420 bytes
font_01_sfnt_off0000eb1a.bin
83e145255bba1187315a2ca8aa8393b3532479ee2994c61f1d3fba8852023451		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 10276 bytes

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