Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b6e1993065a61a…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 00:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 26dec4cdc6bd69e79074cd6303d33e8f SHA-1: cd7d979c3fdb5d657a62db04a6658701d8576c91 SHA-256: 12b6e1993065a61ade0141222b845b1eccdbda0b958de5e51d3f6a55664dcba4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URLs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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 https://irlanc.ru/uplcv?utm_term=dr+who+james+corden PDF link annotation
    • http://hvezda-pardubice.cz/files/file/fujow.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/90533555191.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/42039646946.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/31142696392.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/nilexilufunitozuve.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/30884201872.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/garamepew.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/68097042003.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/78160744082.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/15946190592.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/fedukax.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/difirinazuxosowu.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109140445205984.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/poketabebopowin.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/59741855327.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/35317033730.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/deresutebugekazoxade.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/sivuron.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/67222609457.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///10308517118.pdfIn PDF document text
    • https://vpmemorial.net/images/file/kivumetes.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/51860894911.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_off0000e5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EC 10616 bytes
SHA-256: 576baca0aedaa906ced884d7b6ec0e79c255dc835f9564b39bc691aaac442d58
font_01_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 17664 bytes
SHA-256: 3abf435b815cc05b7fca9a96dfc8c0cdfe2b9c8920293bd771852a5eb1859e4f
font_02_sfnt_off00012c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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