Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f0c5f258dbe6c3…

MALICIOUS

PDF

69.2 KB Created: 2021-09-14 05:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7531a018b15a4dfbe66bdc32fb47e0c4 SHA-1: 9b593ddd2d863b04ea1616b5cd4c7d55154da0ae SHA-256: 23f0c5f258dbe6c32c8dbbd6232eb9aeb08897bb17a56d97fdbdf839e6cba92a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on distinct domains, indicating a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded URLs suggest an attempt to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/mazegidabufabonisima.pdf In PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202193131884829.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/38069276527.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/newebunazefopodaleri.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/48671156910.pdfIn PDF document text
    • http://c-amc.com/upload/files/25447543024.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/44754279104.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/buloluwebapefupodowi.pdfIn PDF document text
    • http://labsshop.com/d/files/nezilajiragomajemaramulo.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/73775155205.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/52131764630.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/tikeradolutojunawugi.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/nozonewawitomogirina.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/bagolagemesofipajarilas.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/20638910643.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/kaxal.pdfIn PDF document text
    • https://bagstyle.uz/images/file/91590689692.pdfIn PDF document text
    • https://primer-spb.ru/files/files/xajon.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/45333074584.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/suvuwasene.pdfIn PDF document text
    • http://keyday.ru/files/files/pimazan.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/vevekaromorukozijad.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/72809046408.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/wudolew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=zini+tv+apkPDF 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_off0000b17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17F 15924 bytes
SHA-256: d6331ea7bcf816d58f019bb70f5ee8a0a1500659e1303245be303c4f18ea98c1
font_01_sfnt_off0000da23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA23 9800 bytes
SHA-256: 0ee3876027d80c587758bc17e2217fdf00eaffa1e63d33390821657e66d0eb9c
font_02_sfnt_off0000efbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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