Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a6f8bcf05f52b2…

MALICIOUS

PDF

79.4 KB Created: 2021-09-22 11:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48f3abcde8156bdc246f9310518053d6 SHA-1: dbc5e5767ab20f5942daec89d6c8815603662728 SHA-256: e6a6f8bcf05f52b2f525c8d2aeddf4f01e877ec57d4102d2dc76dc48e1fc9cd4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm designed to distribute malicious content or phish for information. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pixomot.ru/uplcv?utm_term=girlfriend+mod+minecraft+pe+download PDF link annotation
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74340990132.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/55651418251.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909083230.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/75412899840.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/kaxavivit.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/70380920248.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631901542.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210912210925.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/70788330367.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/dexerixelimusovunu.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/bowixawanepanaz.pdfIn PDF document text
    • http://domplus.su/userfiles/files/tebadijitoxadafobesus.pdfIn PDF document text
    • http://hairandoil.com/uploads/7848007545.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/govafewizazapuxikurabunet.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/94308889142.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/wesijixabaxizerojat.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/30258139504.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463cc240f1e---15562654674.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/64393816071.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/9245298140.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/34656665882.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/51603597116.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/79520211890.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/39156606290.pdfIn PDF document text
    • http://jaqalsports.com/files/file/86919814561.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/59772878649.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_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 19016 bytes
SHA-256: 57ac57f49b9e8dde36c5eeaefa74e4ec958526ac8b578dfa708e17f305591a86
font_01_sfnt_off0000fed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 10736 bytes
SHA-256: e80d3c7d19f2d052d0a31d562716f47593e8b0131e697bcbd0cf6cd499f311f7
font_02_sfnt_off00011788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1