Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df39a6f11b2130f…

MALICIOUS

PDF

70.7 KB Created: 2021-09-29 07:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ff0a81b9e957dc97715ff5150e1ae15d SHA-1: 5873bf75e768d1bb5c43d9fa94fc61dab1f3f59d SHA-256: 1df39a6f11b2130fbcb2b069a3f4404e1052b2ca75c2b2a2a75888048b79533b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into visiting these links for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://fields-on-earth.com/images/blog/file/88981927564.pdf In PDF document text
    • https://cissud.it/uploads/ck_editor/files/gukitalelunexirixominav.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/wimuwefuku.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/82281866372.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/malen.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/35540971058.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/68540257456.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/7733431106.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210921_C7CD55FB666C845C.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/47323694862.pdfIn PDF document text
    • https://umartravel.com/files/sevisigub.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210916054509.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/sutagowuxatik.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/18740898217.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/kitazosepezeratid.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/pesepozasan.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/86379874438.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/wenut.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/wizimifutidivuzamewo.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161537c7e51d4a---56577680156.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/nafusafabitiziwodaval.pdfIn PDF document text
    • http://www.heksan.com.pl/file/65042521076.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109091857323075.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/98748267451.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/021fb721490b78a04dd569cdd56580a6/31651937977.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/fomowikezuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=video+wallpaper+pro+apk+latest+versionPDF 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_off0000b3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F4 15112 bytes
SHA-256: 854400df6a7595014d03bc5fd95396683b1e655492e894de70b5c022acdbfd29
font_01_sfnt_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 10596 bytes
SHA-256: 19692b82714fc82a0f6125a00fc1f3d2eb4e059ce9ee4a9f569dcadf681ce1b7