Malicious PDF — malware analysis report

Static analysis result for SHA-256 885d187417b5ebfd…

MALICIOUS

PDF

74.5 KB Created: 2021-09-17 14:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f7dcae89480e9705609787445109cb1 SHA-1: f4b470a8e0f268899c7adac59896e97814fb9e92 SHA-256: 885d187417b5ebfdf418a89a4652e7c07c1cbb549bc01d96bc2c8b1227fe17a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple unknown reputation URLs were extracted, suggesting a phishing or malware distribution attempt. The file's structure and numerous links point towards an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://queensflower.nl/clientfiles/ragidavopuxutudowi.pdf In PDF document text
    • https://associazionedynamica.it/uploads/file/95955818540.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/dudifukiv.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109070652569793.pdfIn PDF document text
    • http://husplaza.hu/editor_up/19634238267.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210913011740333294.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/fuvobevomexitufomapulefa.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143f0cf52aec---pukegulubuwo.pdfIn PDF document text
    • http://datcat.vn/2018/file/13383690203.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/noviv.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/45998053174.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/75393749697.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/bexagi.pdfIn PDF document text
    • http://sung1.com/upload/files/95343172580.pdfIn PDF document text
    • https://aayams.com/userfiles/file/53921280940.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/winanipaxerifa.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/2827879444.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/zujiwepunava.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/35703308808.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/nemedosokexasakosafexuw.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/8542096746.pdfIn PDF document text
    • http://chineseclothingonline.net/File/72190463618.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/zanepovojatej.pdfIn PDF document text
    • http://fkhd.cz/data/img/mariw.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/81064967228.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/gominesixufuxerexewitowol.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/60617053826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kumkum+desi+serialPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25F 16852 bytes
SHA-256: 146ec22cc7cc9c785d583ae243a05f535fbdd14f94d77048dcf3bf427b7a954f
font_01_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 10268 bytes
SHA-256: 805f7c59a77cc1fdf5e8a60c59ecfeb2a74fc3fd5408be9965f500b3e21e9420

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