Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ec720126cb747b…

MALICIOUS

PDF

75.5 KB Created: 2021-03-02 23:09:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0133da00424a6adae85949aa1c1fcbd5 SHA-1: 73a69dffce4faadc14eec1943ba30009bc2992b0 SHA-256: a9ec720126cb747bf117ce0af7c0313a674215100e0170baf4f6d90707b51813
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 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'https://xajibur.ru/wix?keyword=example+of+friendly+letter+for+elementary+students', suggesting a lure or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content through the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://xajibur.ru/wix?keyword=example+of+friendly+letter+for+elementary+students PDF link annotation
    • https://cdn.sqhk.co/wotirixa/jgie5j6/bloc_political_strategy_games_android.pdfIn PDF document text
    • https://bokesavuxi.weebly.com/uploads/1/3/0/9/130968985/kufokimixe.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/9ibgjjb/dragon_ball_fighterz_arcade_stick_xbox_one.pdfIn PDF document text
    • http://osummer.space/why_did_miss_muffet_need_a_road_map_page_1841qxr5.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/UNigs9T/49234254653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488330/normal_603e7517c2e5f.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/jklwifn/aivatar_animated_sticker_whatsapp_wastickerapps.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386091/normal_5fed0da7a05a6.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/gajabedafot/3513269661.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/rusaxudanudipuzavizetu.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/gonudiziro.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/31091775863.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/pogegenuwezofagipu.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/change_my_mind_meme_format.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/bx80_optex.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/zonamelosabire.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/slope_intercept_form_table_calculator.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_off0000ebfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 5316 bytes
SHA-256: 37e5ebfdca9b6bac36f4ec2938211e02d40cebceeb5fe7e2dad89ba0402b8ad0
font_01_sfnt_off0000fe07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 10156 bytes
SHA-256: 8bb727eddb53fb232a7d218e7d6670f4cae35c2c8013971552a54958183c5594

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