Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb78482f41b612d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 03:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70df6b0b2de120e03f2edfe3629558e4 SHA-1: 10d37b2c331ce26f53b35148405dd3c93245b705 SHA-256: 6cb78482f41b612d7cb95ff19fa09be790bf24d59e173a5335cd2f4c7f01c3dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous external PDF links, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to other potentially malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://3e-recycling.ru/app/webroot/filesfiles/62098773823.pdf In PDF document text
    • http://duepassidalcentro.it/userfiles/files/72334739039.pdfIn PDF document text
    • https://naves.cz/res/file/66790940519.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/11949471871.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/rozeregatujalerekalu.pdfIn PDF document text
    • http://www.moyekolodin.com/files/lewevapuloganased.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/wamopenonemeko.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/mikunujarili.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/babaxonirimuxedewitome.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/559252305613206ca8162c.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090720445328.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613320b70ddf8---35345622382.pdfIn PDF document text
    • http://asfalon.com/__files/file/favuwu.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/gozapadagot.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/35382338134.pdfIn PDF document text
    • https://tadimtursu.com/image/files/12248837971.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/lafelojonaweral.pdfIn PDF document text
    • http://hoachattn.com/image/files/437053761.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210909031519.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/77450036324.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nixenuralafe.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/95815167500.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/92687959747.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a624e27b---48153391232.pdfIn PDF document text
    • http://mweb.cz/images/file/56364918949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=keymapper+64bit+apkPDF 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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 17712 bytes
SHA-256: abca597085c868ada271abdeaeee61a11396db2f4b3ec4ab3cbfad88cd3da6e1
font_01_sfnt_off00010b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001238c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 10556 bytes
SHA-256: a507650d2e12cab0170d01ace32d740693bf721f9b0fa868b7f799612cea66f3

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