Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8364deee0244a6…

MALICIOUS

PDF

69.6 KB Created: 2021-09-12 16:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fcf16c4cb63fc2438e96d2fc2cfbd72a SHA-1: ffe0ee75f5514d1cf482f7ecfc91f50aa00eabd6 SHA-256: da8364deee0244a656d1082a55e7b9bf7d64e0277ddb542775b26dd7ea18c84c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

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://sydneystudytour.com/accounting/userfiles/file/10152278078.pdf In PDF document text
    • https://ienter.bg/files/52444940131.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/jijivonajikisi.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/91458632322.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/zasirowekikuzuluxekenu.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/21854828907.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/40953667337.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/jubonaberoxikebosawur.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/zoweko.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/98571002104.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/33394520286.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/nibuporepuvif.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/petuzuba.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/56239407329.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/61921421818.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/62892384723.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/tejuwa.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/finisojarafoxawakuzi.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/tefuji.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/49006112575.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/59653194031.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/20156964963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=you+look+pretty+today+in+spanishPDF 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_off0000aec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC6 16352 bytes
SHA-256: f0716f0f8b4498e754b7c21ecce2c3623b897e3214e24666a343002d71bd2c4f
font_01_sfnt_off0000d843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 10780 bytes
SHA-256: a7f583e548ad7689b6f353a833541555defab7e9579bd632396abe91fc11b175

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