Malicious PDF — malware analysis report

Static analysis result for SHA-256 27649e94502c0b9d…

MALICIOUS

PDF

76.7 KB Created: 2021-09-13 02:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 755e9c23402ccf65a6902377f3aa77eb SHA-1: 38c7efa812de89ee5fd0bf08be4f1096db46ab74 SHA-256: 27649e94502c0b9d3da364e5a5162506d1c9b6a99221de35db7e55b7112d2f32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://artedeeducar.com.br/ckfinder/userfiles/files/tonajejijus.pdf In PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/45610323988.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/xafevupewazufu.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/74073075452.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/64635768767.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/79170614500.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/78651016811.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/jirudidi.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/67149888981.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/kudemadapotoxaj.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109021205105371.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/74260070972.pdfIn PDF document text
    • http://pjteam.hu/uploads/97526494719.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/fetutodowotizirajibabi.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/nubulurodijolaporolame.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/nixumulikekodanuxo.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/77861535100.pdfIn PDF document text
    • http://sb-78.ru/files/file/jomaponokiripurogavew.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/bimisosadozezijadivizope.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/rogafu.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/bivodiginiropizu.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/wubitejevomilup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=bad+things+that+start+with+gPDF 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_off0000cb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 10368 bytes
SHA-256: 2f74a02c89fbce80a91d6abc664554f119dacceba9cd7d9f84d5dc9c2f6fd677
font_02_sfnt_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 16644 bytes
SHA-256: fbf76a00e0f385ea53c9d93839d1b71bf944d0e2caaa10d7efd2a3c5d991bc31

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