Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bb38ab851e91ba…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 02:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 734167c77adefdcd1f94c7a3235ef014 SHA-1: 9dd931003da7ece783a0b3fd6bf7f325e1131ebb SHA-256: 71bb38ab851e91ba99acf4c7c4e24848daa0a34ec4274b26560e25f634642949
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://medvor.ru/uplcv?utm_term=slow+motion+apk+without+watermark PDF link annotation
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/pg60ubd6ehdfa93d86tdefrcfa/lavorijiduzaganovil.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/nozamaxetaku.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/79811387795.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/tuvekugenexeluxejaw.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/a04u70jcidoq8mk3qvp3886fvn/27690169565.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/ruxede.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/83440575561.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/finigelamadofok.pdfIn PDF document text
    • http://le383.com/uploads/files/54727802841.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///10748378886.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/32657303990.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/nodotova.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jurevilova.pdfIn PDF document text
    • http://yuli-china.ru/d/files/jinemabutujowave.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/42377132474.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210909_052139.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/12851098462.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/kovafunu.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/wurodufuluw.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/sagoniwameno.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/67421907984.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_off0000af0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC722 10700 bytes
SHA-256: a01cc6b38e8def488266d0b6fd353321ef635867d24cf28da7b60713dff12f4c
font_02_sfnt_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 15364 bytes
SHA-256: c89cfa5d6ceeeaa552bf247c8123e22a7869c92dc134b235b45acc4a2c7b82be

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