Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fadcf448102b49b…

MALICIOUS

PDF

109.7 KB Created: 2021-03-31 02:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eddf33922d0d28fbe661bc2f0468401f SHA-1: c01c482cc95eddb5b894b50efd5a4b3d0a5f8283 SHA-256: 3fadcf448102b49b127aa93b165217888cd1f40c83cda56514ae77f31436a1d3
156 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 of which are likely part of a link farm or SEO spam campaign, with one prominent link pointing to a potentially malicious URL. The document body is heavily obfuscated, but the presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the primary goal is to redirect users to external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=bronchiolitis+management+pdf
    • https://cdn-cms.f-static.net/uploads/4478928/normal_605e17f7bd7b8.pdf
    • https://cdn-cms.f-static.net/uploads/4470221/normal_60420acb07cc5.pdf
    • https://cdn-cms.f-static.net/uploads/4369766/normal_605caf2fc5481.pdf
    • https://pefipufipukota.weebly.com/uploads/1/3/4/0/134042651/minodewuxujer.pdf
    • https://bosonelete.weebly.com/uploads/1/3/0/8/130873804/2184845.pdf
    • https://cdn-cms.f-static.net/uploads/4425921/normal_604dc6c716449.pdf
    • https://kuzosilu.weebly.com/uploads/1/3/2/8/132815793/4885b4e102af9d.pdf
    • https://static.s123-cdn-static.com/uploads/4393345/normal_5ff1da678072c.pdf
    • https://wagelefukat.weebly.com/uploads/1/3/4/2/134265927/85092.pdf
    • https://vijibasotaxeja.weebly.com/uploads/1/3/5/9/135990507/3099373.pdf
    • https://mazabutefudoxuw.weebly.com/uploads/1/3/4/0/134017854/9100201.pdf
    • http://hristogrigorov.com/gurevosesovaneveji20slz.pdf
    • https://bajigexok.weebly.com/uploads/1/3/4/1/134131467/6010044.pdf
    • http://ukrinsure.com/star_spangled_banner_flute_sheet_music_easysdnnj.pdf
    • https://zaxifugerabapaz.weebly.com/uploads/1/3/1/0/131071175/logifuronozevo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_ead9533e92d943afa874ae2aae890f5c.pdf?index=true
    • https://s3.amazonaws.com/betefowubevat/77938057283.pdf
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_30db0d58378a4789b9ffe24ce1c42be6.pdf?index=true
    • https://s3.amazonaws.com/kabisebax/best_bowflex_treadclimber_model.pdf
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_1a47b4011a5f4d989d3e33d75487e9aa.pdf?index=true
    • https://s3.amazonaws.com/tinivukedeta/dengue_test_positive_report.pdf
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_e207f7d8b3e242f290de0089740111b9.pdf?index=true
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_4e6eef2f4fff46f4b34a568df197f4ef.pdf?index=true
    • https://s3.amazonaws.com/sogovekevi/33346604244.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ead.bin
c222077a649c781378675afc1e15ba6d81b9bc5f93c465aeff730dbe4070c5e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16EAD 5616 bytes
font_01_sfnt_off0001819a.bin
fa0e71100917696d8afec715a86ffb99c8bc7dea4e2572bc94d0f48e18df3bbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1819A 11520 bytes

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