Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7a4608bc5703ae…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 22:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b14576c87abd7ba3f59b91156aafbd85 SHA-1: 73e1150bdd4f4bed3adde5054b64751b804e47c6 SHA-256: 9f7a4608bc5703aec8a5a249b017ff5aa6c21182eaa4d2cefcc44f93e47d9599
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggests a phishing or link-farming scheme designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://chcial.ru/uplcv?utm_term=m4a+to+mp3+android PDF link annotation
    • https://wineuniverse.us/userfiles/file/mitavotidizisopokap.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/tedozewajifok.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/lozalo.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/57465027335.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/wetajepebu.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631480475491580490.pdfIn PDF document text
    • https://kimcert.net/E/file/72463699070.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/73919635675.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/xuwomibegipita.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dceda42a68---fegafasovexivove.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210913_161706.pdfIn PDF document text
    • http://glttek.com/userfiles/file/78186397152.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/veboxolawiwasitalifubapo.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/vevuwividakipoduw.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/neretob.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/ganotofewipumalejetireku.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/fujawebigelevobinile.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/cca0fb869d47d202959eb682c592281f/69380498181.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091020440580.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/fezosubox.pdfIn PDF document text
    • http://mega.kz/media/upload/files/9496569554.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/74032624171.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/71724054556.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/14522096727.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_off0000ce41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE41 10452 bytes
SHA-256: b70dcf09ae48d3165f18438a54b755e24f2aed6f8bf8986ea627d56a15dd9d9c
font_01_sfnt_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 17000 bytes
SHA-256: ba3bc6e57e2dcb6211ff42f8f36c1a1ac40d2d0254a6d9662e9b2a238b98a18f
font_02_sfnt_off000111aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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