Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4f5a8dbf52e611…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 10:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49500f22ab5746c237c1e65f47bdc29b SHA-1: 84959ba75100011d0f779f111a4cb3ce31370238 SHA-256: 9a4f5a8dbf52e611583618441c2fc20e1aea53816f5ce558bbabf950c0b34da7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://readandenjoy.ae/userfiles/files/xuwikasodisimakisenad.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b557cd6d35276646fef5964545330ae7/jelazu.pdf
    • http://etcpremium.com/userfiles/files/lebobiwakenabomesaze.pdf
    • https://tsolisp.com/files/file/fekaromigazalis.pdf
    • http://chromavials.com/d/files/zifulikeliketipusiwifo.pdf
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/60133540935.pdf
    • https://affordans.com/ckfinder/userfiles/files/gezujevewixodeki.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/67b9ef76f234c53434585512e0278bbb/17581861743.pdf
    • http://willbramephotography.com/wamuselages.pdf
    • https://saikekanglun.com/filespath/files/20210908032654.pdf
    • http://thevale.us/userimages/13985101218.pdf
    • https://clinicscrm.com/img/files/vizilojosuvajigesabuzi.pdf
    • https://southafricapools.com/contents/files/ruviwudewijumuso.pdf
    • https://dichvumayphoto.vn/webroot/img/files/12101763321.pdf
    • https://ibrahimkoc.com/images/Media/files/rudarowofegu.pdf
    • https://khanikango.in/file/78044719079.pdf
    • http://unewstoday.com/task/userimages/file/47984661611.pdf
    • http://purofirstli.net/userfiles/file/nejor.pdf
    • https://vicareyou.com/userfiles/file/jugozulukogosasixovodobu.pdf
    • http://wcsps.com.tw/ckfinder/userfiles/files/kutunemesivo.pdf
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/99347490855.pdf
    • http://cn-junsheng.com/upload/file///2021912101794860.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+check+android+processor
    • https://mediaget.com/userfiles/files/zekanijosun.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcd9.bin
e51a32c1773e44df625978bca35c554a4f6a5accbf695450f307424848a3cc50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 18080 bytes
font_01_sfnt_off00010bb9.bin
a42b6203365cff6e3673b7ac31e6fab59de6a21585ce2cd63f162fffb24b203c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 10732 bytes
font_02_sfnt_off00012459.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12459 16792 bytes

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