Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10a9999adc37cd6…

MALICIOUS

PDF

80.8 KB Created: 2021-10-07 18:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5bf16fbee9c318d8744c4ff23a41a48e SHA-1: a43a7dcb2f0fd854063bfc105dcb26778802cbc3 SHA-256: b10a9999adc37cd69991311835dbc484de61b06b5b0e6bad3a9d8d8f6edf1e3b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing sites or download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, reinforcing the phishing or spam lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/uplcv?utm_term=syllabus+for+group+1 PDF link annotation
    • https://mn-lawfirm.com/box/userfiles/file/jimeze.pdfIn PDF document text
    • http://ch-yang.com/upload/files/pemudenaloxozinunikegenoj.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/sofajuzipubusururosele.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/16445407242.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/dadoz.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/9527152345.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/fotur.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/83541992031.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e6ef1e247e3bd2a2eb189053dfdf637f/72098305613.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/bowabaxigefolulevulolut.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/33878993597.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/89855856546.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/kunozij.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/53691971079.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/22163756009.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/nudumusovuduwadakemudo.pdfIn PDF document text
    • https://datawire.gr/files/files/1218763786.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/76686939364.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_off0000d37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 19172 bytes
SHA-256: a6993d1ca5ea59bdcba8788964f08e1b1db517198abf04489a886b8cc6dc03e7
font_02_sfnt_off00011daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 10588 bytes
SHA-256: b025516ddeed7eca5c9f793840657d084bc38cf9b0243861369a99bb1ab5bbde

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