Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc23576bb16e67b6…

MALICIOUS

PDF

84.2 KB Created: 2021-09-23 21:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d0c4bcb59ebafcf469bfc67c5ac4695 SHA-1: 04a7ed858de5666e616614178541669a3b55a46b SHA-256: bc23576bb16e67b60176b3428f3e9b42da9362587d01809cc529d326800c8dec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The presence of numerous external URLs, many pointing to PDF files on disposable domains, suggests a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://tipkeo.com/js/ckfinder/userfiles/files/konatujevufolarinowiwajiz.pdf In PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/subuxijejegumiwe.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/5236886684.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/46316544550.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109030803129190.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/80768835924.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/wofobajesakun.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ec0e93d3b---94251366225.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/54057055349.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/10574278534.pdfIn PDF document text
    • http://abwva.com/uploads/files/10758295490.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/jujonotipofiwozasominisu.pdfIn PDF document text
    • https://mfdesign.hu/files/file/jozawekaf.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/40536212913.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/paworara.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/nobumekuvuvesajoku.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161314771d4673---lijibis.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/degajozivoxekixima.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/muwuvopafevipit.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/48731231204.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/lodunizemutakojofuj.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/79403392615.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/valekowowilid.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443a728b75f---xajatunejurolufos.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/88905376430.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/risipenanogosel.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/42029463515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=apple+iphone+5c+price+in+bangladeshPDF 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_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 18712 bytes
SHA-256: 431fef202bf8d02e956261489c0bb6bf8d6e33a4fe49c8517e8de931d29dc838
font_02_sfnt_off00012a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0B 10952 bytes
SHA-256: fc814a188e81dbfbefb532fdba188ee47e38c4dd18f9ef665e40e9e29ad4ecb8