Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d1defb50636f80…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 20:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 215074a4a5ef976d38a027ebb30999f6 SHA-1: e048fb3eb971bbf03550ef00611ae049cff1def4 SHA-256: f9d1defb50636f8029ec65b6a37ae1acaff3e0fa5750dd1814e3fcb6b95ba061
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many of which are part of a link farm on disposable hosting, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chcial.ru/uplcv?utm_term=smart+dns+proxy+apk PDF link annotation
    • http://zsdbiopharm.com/upload/files/29564093588.pdfIn PDF document text
    • http://soc-in.com/data/media/files/32709305469.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/demokamitagawaleliforu.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/rilexuduxoliwasal.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/15324030249.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/70082579676.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/vozuzavuvitufelitalu.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/30577964796.pdfIn PDF document text
    • http://robbes.nl/media/files/podevejoreserifomuxajenu.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/kiteritikosategor.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/63183076891.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/gizupakironokunulilis.pdfIn PDF document text
    • http://master-br.ru/img/file/jemunexikegaragi.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/potigagosadagutiwif.pdfIn PDF document text
    • https://andhimazhai.com/images/files/75741622611.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161409f8c4c1fe---66340402926.pdfIn PDF document text
    • http://mq-water.net/upload/fubadopoxigoxag.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/tozinixufikelolejumezu.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/bopulididez.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/mituxenajizemixaridosaseg.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/rinomuzokesiwerane.pdfIn PDF document text
    • http://usagimatur.com/files/others/28872546616.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_off0000d0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 10664 bytes
SHA-256: 5230f365558031465d91911c20cdf9df8ccbd716951aa04a845b10493f1e8593
font_02_sfnt_off00010179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10179 18232 bytes
SHA-256: 072ed76721f8895a71058723dccd5b4434cb074d66f75bb18aad70d1b7bf5dd6

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