Malicious PDF — malware analysis report

Static analysis result for SHA-256 1095d07dad8d6408…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 15:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44f902b92d8c15d167edbf89415e8ed0 SHA-1: 5f15cb17a72322f0774b2ccece3ce461985572c8 SHA-256: 1095d07dad8d640847b366193528b2d95fc1061747939a855f91eef0a36a1ffe
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are structured as link farms with UTM parameters, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://queure.ru/uplcv?utm_term=buffer+stream+football PDF link annotation
    • http://ortopediaszombathely.hu/editor_up/zikekokaj.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/sovajozaxakelawamigol.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/mujalajaxan.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/fomopepijetevegulopapuran.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/gunotidorazepopefaf.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/nagexufebisawepu.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/lopawezurokumizajoz.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/051604405151.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/sanekaketafizaxelogu.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021991921111038.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/mopaseki.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/3071341852.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/guwekowofetidetodib.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/potafoxibidutuwupotider.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/61084082056.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/13139281399.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/17657991378.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/90164556645.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/febefezuwewogafopelup.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/dabobojawuveda.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/jexovap.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/liloraginoxixusew.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/xorebazolag.pdfIn PDF document text
    • 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_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 10472 bytes
SHA-256: fefbcb3321535abb35c47556ac5441cc62e81b039c11fffb22bd8898993239f7
font_01_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 17688 bytes
SHA-256: e332669aed1554e4109ef5902cbf546401d9013f3778cdee4ebeb8b16f7ff387
font_02_sfnt_off000122d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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