Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca7cee5aca93ba2…

MALICIOUS

PDF

106.3 KB Created: 2021-09-24 00:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0001174b82826a6df3f8b2e21e265ca2 SHA-1: aae120a6ca0d850c443a336655e8054070a5123d SHA-256: dca7cee5aca93ba23e533852300a31998aeddfc1e2361207c40df2b1dd83587f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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 http://peak-experience-japan.com/images/blog/file/gison.pdf In PDF document text
    • http://smolninskayahotel.com/userfiles/file/18415482436.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/37894882526.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/senarijimunasovugedeko.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/84424169754.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/vigazuxutewuvu.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/28657338546.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/28103e36a17792f5695596c1ad4fa669/40854080069.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/xejivo.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/kovijusofiwifi.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/wiraxevisejudifotimede.pdfIn PDF document text
    • http://citra.cl/userfiles/file/savexubugezaluxuxof.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/16359124509.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6f72d3083---simerojetew.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/vejevelumudodepigeferadi.pdfIn PDF document text
    • https://dienmayngalinh.com/img/files/vesexorumanekapeje.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/dixakuzukimajabevepapub.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/87628264241.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/zukidugawetuxo.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/68592892312.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/94652593694.pdfIn PDF document text
    • https://8-hi.dataroom.tw/upload/file/dosukebematij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=dictionary+p+wordsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001378a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378A 10528 bytes
SHA-256: 2ea3a7cee659a22db9a996c54b60a824bb4ec92677020849bd919ab64facb51b
font_02_sfnt_off00014fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FBC 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
font_03_sfnt_off000164cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164CD 21640 bytes
SHA-256: 303b1b5a31a7cab77fae42fc996f67785014b18f29f113965e14bec40489caf3

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