Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8d124230863b23…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 13:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b212eabfcd716369b62b1377523a196d SHA-1: e88cb996b88cfc4ad4f9e84b7c131304dc9c5491 SHA-256: 1d8d124230863b23838543ce006df846e27b6dbf5056cdb8e1a2f946ea4c624c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating a payment redirection lure. The document body, though heavily obfuscated, combined with numerous embedded URLs, suggests an attempt to trick users into visiting malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_URI heuristics further supports the phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://aradovan.com/userfiles/file/71975769982.pdf In PDF document text
    • https://dafelia.com/files/kivazetulosovobib.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/72218414967.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/tizigilibugoxisobe.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///66780514102.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/sanonevi.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/lejusajokeweso.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/25153313475.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/42883756916.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/89335836011.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/78725677671.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/xusifemelulisevejobup.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161344c7cb45f7---surimudamuliwavilaruzo.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/95384991019.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/liwapesupesotet.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/loriwuvovidirawezur.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/futomodofovoj.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/dopusug.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/sa2jmd6tq3a2sjoqp6nlc34r66/tarusidubuxavipesasu.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/95810067633.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/87732874720.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/temowovodinutazen.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/jezijuzefiwotaserim.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/wukuwesalunaxefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+port+whatsapp+messages+from+android+to+iphonePDF 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_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 17420 bytes
SHA-256: 7272eb370b81fb855b7fb9e7f7fb24a4b95a1ec593c327a463475391cfae2e43
font_01_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D5 10976 bytes
SHA-256: 1d91edbcdd1ba3784ba27bfefc917a4a62929f78f94a372c6af08b265435b740