Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6d564d9b8f46f5…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 13:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a694f7d418936df7433ad3fe6eac9e99 SHA-1: 28b9cbeab3e835bafa974a65095f74fe827c4bcb SHA-256: 0d6d564d9b8f46f53dbe2e0d64d4e482f11b90b6e30f691b9f92acc7e514779d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. The heuristic analysis indicates the PDF acts as a link farm, containing numerous embedded URLs pointing to potentially malicious or unknown domains. The primary attack pattern involves directing users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oilbasaro.com/web/images/ckfinder/files/20210924225852.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e9776d22a---nunopisoj.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/89039383242.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-24/20210924004701421620.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/20384479489.pdfIn PDF document text
    • http://apple888.vn/luutru/files/69228091598.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210920234600.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/22067027537.pdfIn PDF document text
    • http://bubb.cn/up_file/file/994255090.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/49609114355.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/90952764143.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/35528386314.pdfIn PDF document text
    • http://yanartextil.com/firma/files/30297511325.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16133972025f50---64824620986.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/nowidujutipogizaluzupameb.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/32119032618.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/90778622189.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/31645184464.pdfIn PDF document text
    • http://hiddengemsbookstore.com/userfiles/file/98582408615.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/86720329253.pdfIn PDF document text
    • https://km2804.com/ckupload/files/pipodesugivirewelo.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/zajojisam.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/kokexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=python+3+apkPDF link annotation
    • 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_off0000b0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CF 15416 bytes
SHA-256: 8c7bedd22959b4d7256421bd3263d6728d1bac659e429537762b9f9bff66d0ed
font_01_sfnt_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 10192 bytes
SHA-256: 4bd72ad80842a33ac77aa31acc4acbeae9d6c1234749b58efdd6c5e5accb662a
font_02_sfnt_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1