Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9012d6e842f9593…

MALICIOUS

PDF

82.1 KB Created: 2021-09-10 20:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 835d294a0d2df81bfff978d1748d7019 SHA-1: 7f0622c56aa91586f9590b78aa9cbbd11338c4f4 SHA-256: b9012d6e842f9593fe7626ab27aa512384b3dce0051ef4b3ff02b9ff5f555ad3
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=slopro+for+iphone+apk PDF link annotation
    • http://kaies.cn/upfiles/file/piloferulodamekufomifax.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/7706372512.pdfIn PDF document text
    • https://braus.uz/images/shared/file/11208173785.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/15935151051.pdfIn PDF document text
    • http://bienbao.net/uploads/files/tenutibamix.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9b99b17a---32668683368.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/farimivusudagodu.pdfIn PDF document text
    • http://davobio.com/upload/files/31341366616.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/tezukubumokifedi.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/69440133821.pdfIn PDF document text
    • http://domainecomps.com/documents/files/57896300163.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/86448695260.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/99109257195.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/38625408032.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/29598437214.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/nexoj.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/jigilavumagusiralubifefun.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/xizap.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/warevenowedivulitutawo.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/73254218976.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/rabenutidi.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/12531020497.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/reriledus.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/gumupolepubipobizosibosow.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://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_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 17220 bytes
SHA-256: 3b77a580be9f4b0dc9850e069a1c21a87eeb8016592405ed422c72cc4059e55a
font_01_sfnt_off00010b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 10356 bytes
SHA-256: 50c04f15909e68abc73f0317031e0de3eb20b32f1543b34c968e29623f427e02
font_02_sfnt_off0001229e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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