Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac540bd782d047b3…

MALICIOUS

PDF

77.0 KB Created: 2021-09-20 14:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fb9811d09bb4ed0ab90ac52fe7eb4078 SHA-1: 02ee08474f2d0e4f06ad97b67c5ce632266469fd SHA-256: ac540bd782d047b3303be6aff4ceee46f99b17bd89a49a89cbe4fa94a83dfaa8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to host phishing pages or distribute further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern, suggesting an attempt to obscure the true malicious destination through a large number of low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://beauty214.com/uploads/files/202109170424451467.pdf In PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/87802959568.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/77326957626.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ce4879210b04f05a83ce93ac041bfb79/lodixategezirok.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/82590839133.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/xasunemarifa.pdfIn PDF document text
    • http://air-ned.com/uploads/files/9259954339.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/wolukewawajuv.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/jemigitilewajikawuvewuv.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/6313592410.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/5817976555.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/77140190005.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210902_5746E67BB043C4A8.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/68235313868.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/babub.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/jafofuke.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/pomaxijokomigilejotot.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16147a26708894---mupori.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/kuvamixapegesedalixetere.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/zolivuluv.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/nonofuzonefudodurejo.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/96717829520.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/91895510497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+can+you+hide+pictures+on+your+phonePDF 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_off0000c948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 17032 bytes
SHA-256: e0e598391fe4abf93ae7a266890dece612809f3ec4cd0c8aa78fcc7136d263a7
font_02_sfnt_off00010d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 10856 bytes
SHA-256: 56eb608e9b4e743fcb68dfa0acd8bdc1e020cdd63152e7a9a649358f5ac02ccd