Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e8c946f8b23357…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 00:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 912be558a53d80670f936ae6a389b476 SHA-1: 209ee115bcf5b65785156f86f98111a18df701fe SHA-256: d5e8c946f8b233572c1a904e77b78687614e8e2c67032f702c2dbc0e863af578
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on disposable domains. The embedded URLs and the nature of the heuristics suggest an attempt to distribute further malicious content or conduct phishing operations.

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://domoticasociale.it/immaginiNewsletter/file/dewejibutowatepipep.pdf In PDF document text
    • https://stoneappeal.in/FCKeditor/file/mujofafeselomeru.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/45787767291.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/48727222324.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210918094636.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/nigewimeriwutudok.pdfIn PDF document text
    • http://come2menorca.com/images/file/84129401699.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/buvigalegonarukibapojab.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/77938665370.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/lerixixoluvamofobol.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134990bd39d7---36091447127.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/lemomofitezogudegav.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/wuvabalasoxanekaresegawa.pdfIn PDF document text
    • http://www.77ice.com/upload/files/gisamuropelufuvivowax.pdfIn PDF document text
    • http://dasbluemchen.com/64301682699.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/65677615103.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/kinikorolekogobago.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/19513788089.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/xasejorowesonuboxok.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/27793742851.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/woxoxagopazuwodebozixe.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa335a9e9---48262209022.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/werufazarapanafutegide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=best+games+under+2gb+for+androidPDF 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_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 11064 bytes
SHA-256: 977174a883fba29c62826f9106d3292685c25b9058c4c92068eaa130ab981996
font_01_sfnt_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 17280 bytes
SHA-256: 472efdce4486b7b1270b221c90cd5a4bd4e72e563a01ce2663cfa5dffcef9679

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