Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4447479cc644275…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 06:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 94e2991af51801fcfaf80764d118343c SHA-1: 98bedbf92a250c7531221a77bf2b88ef1d218483 SHA-256: c4447479cc644275b1bd3a116a9f762de7344eabc464240f2ff2430e3b7efd05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The presence of external URIs and the link farm heuristic indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cansuyu.org/resimler/files/jinomifamuraxetifadaj.pdf In PDF document text
    • https://martensmgt.com/business_school/uploads/file/82356563217.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/jidirixilozunoju.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/kefurezigiwusenir.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/23576105875.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/99491308984.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/85613572996.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/41727095028.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/xabimedo.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/padubudixawenoloxerug.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210908140714.pdfIn PDF document text
    • http://yongqingtech.com/d/files/veparinutazaxujopip.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/44730926311.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/39212590362.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/74382925922.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/67062854452.pdfIn PDF document text
    • http://17njl.com/userfiles/files/pogoxuxitekuliwerelug.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/lorikagurolejegoke.pdfIn PDF document text
    • https://businesslife.com/content/files/ramomidowe.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161305b77a294a---gulolegopigebafekozemiju.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e38721e0a---10431047871.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/jikowemivorefuguta.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/82254543104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+developer+bridge+downloadPDF 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_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 10576 bytes
SHA-256: bbeb9603051d43c84f178f4f5c4dad23082d847fd29191c506fac6e19ab1077a
font_01_sfnt_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD4 18068 bytes
SHA-256: b946887b2ca109fa3a72bb5ae4c6bf5dd0227a488fd306d1eb58801fdb141c31

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