Malicious PDF — malware analysis report

Static analysis result for SHA-256 67581c460c006c86…

MALICIOUS

PDF

91.6 KB Created: 2021-03-20 19:05:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b38914479e2973736def303720d46443 SHA-1: b17fc8de829188e61a6bdf445405ec5a232e2d7e SHA-256: 67581c460c006c8673015bedc9a75e2ef22c0cc60390b07f02882b75fd9f39b8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to what appears to be a link farm designed to generate SEO traffic. One heuristic specifically identifies a 'PDF_SEO_LINK_FARM' with 30 external links, including one to 'https://s3.amazonaws.com/tobaziw/kubalixi.pdf'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=english+russian+law+dictionary+pdf PDF link annotation
    • https://gakurajoduradi.weebly.com/uploads/1/3/4/1/134131237/gezarof.pdfIn PDF document text
    • https://nudatisuwirok.weebly.com/uploads/1/3/1/3/131384101/d8da8.pdfIn PDF document text
    • http://cesaregaspari.com/is_a_guardian_ad_litem_an_attorneysc9ps.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/voxitimagelipiuhj85.pdfIn PDF document text
    • https://kudaxemukuwofi.weebly.com/uploads/1/3/4/6/134691428/dodevep.pdfIn PDF document text
    • https://bifekanivixu.weebly.com/uploads/1/3/1/4/131408854/gufiwopexutojof.pdfIn PDF document text
    • http://natfreshik.fun/saeco_talea_giro_plus_for_sale5r9hw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/tobaziw/kubalixi.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_56aca26baab4448e912bb67570fd62d3.pdf?index=trueIn PDF document text
    • https://1b3e2d6a-0348-4772-9bb2-16e56a761455.filesusr.com/ugd/7bcf02_b4f15d36dc9f424e83e189575fe6e642.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/paderexerare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e53338ff-abc6-4bab-97a7-b0612a469340/what_setting_should_i_put_my_mini_fridge_on.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/58591958517.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/goditen.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/dolphin_browser_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49edbaa-7c4c-4649-9127-78f2ac368808/47407290854.pdfIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_17c03e5eb1ad4abfbf8afe955ae038a1.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_a1e7a941d7eb40ccb7b20d5a136fa656.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/ben_ten_omnitrix_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/holt_algebra_1_workbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/xexafusixotinosixuponuweg.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/diwawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8c78c4-f4d0-459a-8587-a196412fffa8/clinicians_pocket_reference.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/54988380290.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 12516 bytes
SHA-256: 20c3fcca34647b20770daf1760d1723b4c74f49d1a63689fb0cdb87009141a13
font_01_sfnt_off000107f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F9 5568 bytes
SHA-256: b029561f71d54fd6f54f34666c9ad04d1080a9f74b8ed955f733b6283ac756ef
font_02_sfnt_off00011af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF7 7492 bytes
SHA-256: 94f07b26da985959ee462a83d696ae2cec3262a3f0335c03f1e3483ec739a357
font_03_sfnt_off00012f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9D 15332 bytes
SHA-256: c3ee24868bdb56508256c5997ee0ce644b3e12adfe6bfe73bb2dfe373842130d