Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bc13c7128ab949…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 06:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 86fc60fe7cdb5c0e8196d0fef777457e SHA-1: e32332fcd0607df76e69b14681585ce9579b414a SHA-256: 53bc13c7128ab9499b89b1592c1a0b903681721661483a5599fc42f02bc2aa0d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://garglob.ru/uplcv?utm_term=ig+who+viewed+my+story PDF link annotation
    • https://autosaloncenter.com/uploads/files/tepumobafajewixev.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/88093577648.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/18501999677.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/17719554744.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/14670832811.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/45556313529.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/vixorudasegasukid.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/buxoralazun.pdfIn PDF document text
    • http://cwesp.biz/upload/file/gifolotowabamevuxiziribo.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/54465327970.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/80254223212.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/kejukatave.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b2913ade4---6943126517.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/zegipubofof.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/91216935583.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/pikunajijitasaba.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109131318202373.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/nuzuzarebogakepo.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/9855915093.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/g7klq1t22k12bgkb50g122ad05/52062257041.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/zedulotukabaga.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/55398104549.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/14689605074.pdfIn PDF document text
    • http://thaide.org/userfiles/file/zatesogadixobo.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/kazixeloropunerobitumulo.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_off0000d0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 10600 bytes
SHA-256: 9cee46388cbb03e802b3784aa7e2364052045e19d0ecb72e5d45a903353a0ed1
font_02_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 17592 bytes
SHA-256: cb7c050e54f63d351cbd3e3aeb75aa567b80a132c87c630c911b6c8ef0a88f7b