Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c56868a00691fe8…

MALICIOUS

PDF

69.9 KB Created: 2021-09-23 04:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c842849efa0a1839a6bfc48227817f7 SHA-1: 5a75122b2c0b43e4cb4e6f156a3eb0bf1595a8ba SHA-256: 1c56868a00691fe8bff0cdc550544b9e626e295776eda851c4b496104e62fbce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a high number of external links, many pointing to unknown domains, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://headrepublic.pl/images/files/kulobarowuzajidawevugafi.pdf In PDF document text
    • http://sro52.ru/uploads/files/tazete.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/77242231236.pdfIn PDF document text
    • http://cortabellanews.com/userimages/lubabaxibomi.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/25668552137.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/64846240259.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/pakojonafoloximagizif.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/gobugibixubinaguzume.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/senep.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/tazenawitomalupew.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4803f37c580a9e26ff65fc4a88eba601/nogeropagowow.pdfIn PDF document text
    • http://snsi.jp/image/news_file/10171438202.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/91123100726.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/13379963326.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/sozejamezowuv.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109221752228782.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/18532154039.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/befixisamekevadiraxas.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/sebobeporupi.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/jikifa.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/30670999171.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/73898356416.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/13746370620.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/duralapidiges.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/korewoxasoxug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=first+4g+smartphonePDF 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_off0000b396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAD 10708 bytes
SHA-256: 6d73512ed2f30e105f679470d11557f27a05cbd0c03779838092e37243815b21
font_02_sfnt_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 15020 bytes
SHA-256: 2e94dcf2e9240b3c3c19e9f61a929e0b3377a15e1598cc0450a37d527b9ebdd2

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