Malicious PDF — malware analysis report

Static analysis result for SHA-256 9189ac6983245c7a…

MALICIOUS

PDF

131.4 KB Created: 2021-03-25 17:39:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: abc88d805fc8c61a2dfcde450e72149c SHA-1: ceb454528344cd1d2ca812b7bb7b084273c38954 SHA-256: 9189ac6983245c7aae8bee287a166ae65006a9357a7cb3971905a5d81b4f5ffb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The embedded URLs and the document's structure suggest it is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/123?utm_term=journal+citation+reports+impact+factor+2018+pdf PDF link annotation
    • http://lofitner.buzz/deziweevmt.pdfIn PDF document text
    • http://dombitarf.ru/37079499930lme50.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/ghjjf6f/7036648435.pdfIn PDF document text
    • http://fenellalucynelle.info/vutelokubesefsjokh.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/jgjjjiD/duck_game_switch_online.pdfIn PDF document text
    • http://retys.fun/turn_photo_into_paint_by_number_canvas83wzl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_e85fb862b78c454eb05308d9fd435a02.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfaddf49-a841-446b-9b20-22a04f0a3036/how_to_introduce_table_topics_master.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_b75395a3d18849e0a2f3284b6ea932f5.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_63a5073296f842d2b9fd2332d4aad7f5.pdf?index=trueIn PDF document text
    • http://wejonixegovut.rf.gd/being_there_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab4dbc4d-a6cc-4e19-b112-6456a70b545f/17179436115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9082cc08-fb05-4245-91bd-a11ad7bd78cb/26348840655.pdfIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_02a02db26c594b4285e1358e6a6893fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a867d84-77d7-43b1-bdf9-14d755d85a32/discover_110cc_engine_oil_capacity.pdfIn PDF document text
    • http://nonosolagosev.epizy.com/separate_pages_adobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db7a197-cb61-46b2-b9b3-0f71150fd7b1/olympus_om10_35mm_slr_film_camera_with_50mm_lens_kit.pdfIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_93caa606958e4966bf9c6011e783080c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a161d3c-89e2-4e21-8700-2ac2ba45d197/iowa_economic_development_authority_grants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d49722c-4112-4086-ab97-3c8c47c9aadb/gorosabuduxonopireruxi.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7D 57016 bytes
SHA-256: faf84ab72b2c0fd8195965b1ac1ab2b9d33c1a101f16f7e34cab5bd2ebdb2dd0
font_01_sfnt_off0001c510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C510 5808 bytes
SHA-256: 758a83d273490ab01eea128a667cddea7265c2687582fec2078680d1251e0a4e
font_02_sfnt_off0001d8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8C8 10684 bytes
SHA-256: 93f56ac88a1ebfd8833a812ab9fd21ad7f08be7233e75b59e8981468993ee2e5