Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfb95f0243cd2e4…

MALICIOUS

PDF

106.2 KB Created: 2021-09-09 06:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ea1cef20e3a39cdf6f2b21b34385352 SHA-1: b4be224f9e5430122ea189b9a6b07494d8102cc6 SHA-256: fcfb95f0243cd2e40d3af51397e70d5abfff81493f1061f155a5f82cd7b02dc2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable domains, with many embedded URLs pointing to PDF files. The presence of a QR code lure suggests an attempt to direct users to malicious content, likely phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chongros.com/userData/board/file/69611946280.pdf In PDF document text
    • http://home-plast.ru/foto/files/dawejukuwenamopatelus.pdfIn PDF document text
    • https://digireg.es/upload/vasojajoxabematowifos.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/rikodutosejuvop.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/99696046907.pdfIn PDF document text
    • http://belv.ru/userfiles/file/tigitikoduwami.pdfIn PDF document text
    • http://classtool.info/upload/files/nedolerarelejelinowutaxew.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/zezabanajuwaseda.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/62861594882.pdfIn PDF document text
    • https://mollis.rs/files/56754045376.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/15582249738.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/51834867231.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/goxefosidofulizezosu.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/gazuravi.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/7979485743.pdfIn PDF document text
    • https://denimder.org/resimler/files/73476315301.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210904132354.pdfIn PDF document text
    • http://podarox.ru/public/files/soxokima.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/030137183383.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/zanexatetid.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/pakeb.pdfIn PDF document text
    • http://coumert.com/images/file/rovubasepifulenopew.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/84945418380.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210909_54F0B6FDDF3AE9E0.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=google+backup+android+to+iphonePDF 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_off00013b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001531b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1531B 10996 bytes
SHA-256: 7218659b6d074218ca547d97af7b5ed43113e4701e4ca616f743ebe8b00ab183
font_02_sfnt_off00016c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C2C 18244 bytes
SHA-256: 165a3e0f8a9b9b68504fef7f692eeb0ae2fda33295b96ec863cfb16684cee48b

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