Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2dec3fb1374765…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 23:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 79e9e5e6acbbbada133f66f0e0b4f150 SHA-1: 6dece2e5bd4278c6763bba91d896aedfdd069ac7 SHA-256: ad2dec3fb1374765e4ad94b4b780d1c1860e31b14beb16b4e41532134530b4e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The wkhtmltopdf authoring application and the presence of embedded PDF objects are common in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=valorant+new+skin PDF link annotation
    • http://bursaceyizgelinlik.com/images_upload/files/samifovosizadi.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/67264325411.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/tudafa.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/pebumemuwoseta.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/gefuzerolo.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/38795330840.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/80777992418.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/semewemutewokarukoxu.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/96940859393.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/53233616712.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/nufakixuzemosukiwatedo.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d70f6415513e3d70205e52f3057120fe/lesamuwef.pdfIn PDF document text
    • https://mavibusiness.it/file/69812301677.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/95115504407.pdfIn PDF document text
    • https://brakos.it/file/moborujuzetipunili.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/90366237197.pdfIn PDF document text
    • http://jyczgj.com/UploadFiles/file///2021090819532496.pdfIn PDF document text
    • https://strechybenesov.cz/content/52404878470.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/dasukuba.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/gakepodejagemati.pdfIn PDF document text
    • https://successalpha.team/upload/files/sudot.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/60730424147.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_off0000d8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 19760 bytes
SHA-256: 538fb625d6e249356fcc901574587de971a4d6313f8a551790226d0b011b5fd7
font_01_sfnt_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12341 10248 bytes
SHA-256: 3969c3073a7768afacb7f294b9198f985c5a3fdc4b3840bd0c8102b353776348

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