Malicious PDF — malware analysis report

Static analysis result for SHA-256 153738582fdb0210…

MALICIOUS

PDF

76.6 KB Created: 2021-09-17 09:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b46929b3ebab8d34e92fdfa947ea226 SHA-1: a7ab565bc0db15e226a41c4b5821243ce4d2ad0c SHA-256: 153738582fdb02105e6af3a6ae5f452a90902332d17089fa48fd749f09ac3e56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The PDF structure and embedded content indicate it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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://fishtech.org/uploads/userfiles/file/file/bumekanazepavaz.pdf In PDF document text
    • http://massimosusto.eu/userfiles/files/xakilu.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/katofepeg.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/3415765445.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/zezabanajuwaseda.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/lamobovawaxipudebik.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/29017790406.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/3342351955.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/41586955712.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/boxasezemibuwo.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/gigisitomagorikukisonopud.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac19487d8---78192935722.pdfIn PDF document text
    • http://parfumland.sk/upl/fanovonenide.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/molixabarinuzakolupa.pdfIn PDF document text
    • https://ptogel1.com/contents/files/nubipuvitizowugalu.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109011621308918.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/79117439036.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/6m5vuo9pn9qvv877pr44jfvoi6/xotipimokogeta.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/14477541134.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/67998339007.pdfIn PDF document text
    • https://shidoremicrosys.com/media/80633515170.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/vikesexisax.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/lenojaxed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ida+pro+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_off0000bd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1E 21528 bytes
SHA-256: c3daa97e361409fb9e1f6740c28de8c71b393c53a5b331a5ef808a528e804409
font_01_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4A 9788 bytes
SHA-256: f9a54a2091f18c7f01965a07948a32744dbd9d1bf224b01fc91edeea0bd7de0e