Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4664b3851b724b…

MALICIOUS

PDF

76.5 KB Created: 2021-09-12 20:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 231bae8444f2d0d28f6f21a2764b9599 SHA-1: b51194105f77f79b281148797c62aeb20c4adc41 SHA-256: fb4664b3851b724b6b6f3f645ed3f4aa89cfeaf568bceb462312d02a488ce2ab
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. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links across disposable domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://autoroman-service.ro/imagini_ws/53326580047.pdf In PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/biliwowokavuviwuwu.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/5644815331.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/vumuj.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/79509550699.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/54118444255.pdfIn PDF document text
    • http://cecev.com/stockages/files/41870905077.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/gakunijiru.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/bekepurepabinorigukomiriz.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210911213814350939.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/sufowaxetujedufen.pdfIn PDF document text
    • http://artio.pl/files/files/25895524442.pdfIn PDF document text
    • https://led7.ru/file/86577238630.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/74839139024.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/32558337409.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210910202803.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/bomatusamub.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/muzumi.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/77828645247.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/79398726559.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/50816066729.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/83700640309.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/57912977793.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/bukag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mortal+kombat+1995+watch+onlinePDF 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_off0000c60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60F 10992 bytes
SHA-256: 4a2578856c2f90a29090f62d1d132ceea258064bc2d72f77c1f404777f4d3eaf
font_01_sfnt_off0000df92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 17352 bytes
SHA-256: adc3ef86d595fd212d1660582e9d8af8c0e94a02cdfff2342c2bb0486dba1f2d
font_02_sfnt_off00010c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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