Malicious PDF — malware analysis report

Static analysis result for SHA-256 117f71cdaff5b172…

MALICIOUS

PDF

75.2 KB Created: 2021-09-09 02:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31c96deaafcb45d87ccdc100e1f349fa SHA-1: cd221bf0a03f4f07365d372470e8a59c91ff70a5 SHA-256: 117f71cdaff5b172376fe573056a88c1fb5c379317752995a5f4c2b972ebab99
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=android+sports+tv+app PDF link annotation
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131bed8c6e4b---xekebiporipusibila.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/17927829196.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09de75f1d---88640532476.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/vipodumivakemef.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71004930682.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/bunoweziposixapigud.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/goziwokexofel.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/jovisusiv.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/57734786121.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/63439005174.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/79753160722.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202108311818176253.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/dixurokuxix.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/40902161311.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/dudatagawenidomew.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/dawozofum.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/tenoxadesoxuxosirerifoz.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/8632243658.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/botitipijezimar.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109041001133571.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/pebot.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/35311032223.pdfIn PDF document text
    • https://ambalatender.com/upload/files/60270400713.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/vulemuzitixenudotos.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_off0000c4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 16992 bytes
SHA-256: 8a32ff5dfb653db91e45a59e05237324377bf078305d79357639cf40fc4d7788
font_02_sfnt_off00010827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10827 10252 bytes
SHA-256: b83d8d5b0a38956de1f5d531235b29be4e44887f283a44b978ad446a5e9bf56f