Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e83a2052dcd3e6…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 12:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a3ac0f37599e8efee174fa851b4a7a8 SHA-1: 7dd2370db0f4c47ac91c40fa6349fdb3a9ae6dae SHA-256: 77e83a2052dcd3e6f9f08bddbf35a272826c335d9f66d546b9c4d6dbffab1e2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and the 'link farm' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wastran.ru/uplcv?utm_term=how+many+metalloids+are+there+in+periodic+table PDF link annotation
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d461239cf---27461037070.pdfIn PDF document text
    • http://hkalc.com/userfiles/fixebenatogigoj.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/fanukalabegozoxakogo.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/66538885917.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/dubex.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/vupexipison.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/85737521910.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/kemasafudivajojejopu.pdfIn PDF document text
    • http://jawarakreasi.com/file/222566090.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/jojamejaweza.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xejizuv.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210917205249.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/90387268639.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/nuzusomuvosidunijuregev.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/11565921797.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/58535551310.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/96912202073.pdfIn PDF document text
    • http://ustunongel.com/image/files/38216341389.pdfIn PDF document text
    • https://granitnet.hu/editor_up/93281770334.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/kejasi.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/3799762025.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/59750603645.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161453fa585967---namofaxufilif.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_off0000d420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD420 18100 bytes
SHA-256: e3592acc8537628f4ee0a1b4ad7bd73357fa565ebdac4866ce3ef94accf60596
font_01_sfnt_off0001034f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B66 11112 bytes
SHA-256: 32b4599dd3925848b23a9f991b4b92e01c3f7bfbb821dac1ed0a01d0dc8ea19d

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