Malicious PDF — malware analysis report

Static analysis result for SHA-256 08aafb2f27164738…

MALICIOUS

PDF

103.7 KB Created: 2021-09-19 00:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8dc4fe3baacae005e9428899c886357 SHA-1: 8f7e813d20d3bf326ff6865ee2ef40c0ae922324 SHA-256: 08aafb2f27164738f3df4c6b75286cdb61305bf9567783eb151c830c80a4a03b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous external URLs are embedded within the document, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 https://ketchas.ru/uplcv?utm_term=john+gba+lite+pokemon+ruby+cheats PDF link annotation
    • https://textosolutionslinguistiques.ca/upload/editor/file/woniwerunaname.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465849a9d42---77101283531.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/10839659812.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/ramozatakibabefi.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/83368417756.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631248460_842496a5c4.pdfIn PDF document text
    • http://stefani.cz/fck/file/4055489125.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/wafobujarutu.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/dojuguvonowenululexusaja.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/19/file/20210919_053425_163.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210910171156.pdfIn PDF document text
    • https://cityface.cz/res/file/videxutarefemisefipuvo.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/xuxadixu.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/15277941750.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/59618521334.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210905212954.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/fozorofewusari.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/jujaganowiwezikagemozugog.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/wulalojubokufujovumizuvet.pdfIn PDF document text
    • http://agro-partner.com/Image/files/jazumifitutaxuwebanen.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/38023219847.pdfIn PDF document text
    • http://jinyezi.cn/upload/17740913088.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/11129737472.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/93944387480.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/bebalufibabijin.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CB 19024 bytes
SHA-256: 1977698dc44d1ad28cc41ce554f921ecb237481463abaeb06eb66d4e47415758
font_01_sfnt_off000144fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FC 11256 bytes
SHA-256: c9759917f64a627bbd77d21e6902f7998f5aa471e81bb411d4b6d06ce567fd64
font_02_sfnt_off00015f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17726 17212 bytes
SHA-256: 2a72b62cedc9ac63277e1188188011af3b89ccabd8cbc27ad05ad5448757b5f6