Malicious PDF — malware analysis report

Static analysis result for SHA-256 736cd51b30fd5397…

MALICIOUS

PDF

94.0 KB Created: 2021-09-12 15:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65a1de95cbe48eb8c8daacedbb8a48e4 SHA-1: a86476e2655c22cd8ad5d7bcb47e17f9f440391b SHA-256: 736cd51b30fd5397bc352d009de006a5d7efed0e1f34a7dcd8ac41960d27932b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and forming a link farm, suggests a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://asken.as/bilder/file/41153920436.pdf In PDF document text
    • https://torgradio.ru/new/files/file/soxoraboko.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/38779336337.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/2694871675.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/simipafiderexadal.pdfIn PDF document text
    • https://somogyplusz.hu/files/3760084986.pdfIn PDF document text
    • https://ibericadearmerias.com/file/56168109084.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/gazisavejoma.pdfIn PDF document text
    • http://hkalc.com/userfiles/zutulawikoruputiw.pdfIn PDF document text
    • http://crediramasrl.it/public/file/defarefuzogivurugixiges.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/nipifebubaferusu.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/90058024522.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/bowifafidadegomijad.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/nakajedaneme.pdfIn PDF document text
    • https://mangallagn.com/images/file/54712764342.pdfIn PDF document text
    • https://gangnampools.com/contents/files/ronosafojilakik.pdfIn PDF document text
    • https://gameclub.by/uploads/files/67933065686.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/zotivinozojuxo.pdfIn PDF document text
    • http://zenkatsu.dk/files/60363637420.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/fazukelixibitori.pdfIn PDF document text
    • https://ismart99.net/upload/files/46492493283.pdfIn PDF document text
    • http://njxinbell.com/upload/files/92589587125.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399abb57301---84475584125.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/xajowejiluxolora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=harry+potter+and+the+goblet+of+fire+full+movie+in+sinhalaPDF 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_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 11356 bytes
SHA-256: 25a7f0bbb64dda059a870a14a42a56f8d4f4e2e276786e00b37e6f7860a5c470
font_01_sfnt_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 18472 bytes
SHA-256: 164e50b046fe17da34ee94deee405867ae0358f9b10698427a674597d3f226fc
font_02_sfnt_off0001519d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.