Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f526ab2bbdbcd86…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 04:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34706587770ff8578f82d25f1b50ae6d SHA-1: 7efb66eae541c3cddd2564c29866312516344045 SHA-256: 4f526ab2bbdbcd869393a3b065add7f6e3302399d91f9be9b485ec8177c80add
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to PDF files hosted on various domains, suggesting a distribution mechanism for phishing or malware. The presence of embedded URLs and the link farm nature of the document strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://tomgiongvip.com/uploads/files/file/62720697857.pdf
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/niluxusolo.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210907091708.pdf
    • http://year-c.com/upload_fck/file/2021-9-10/20210910232944186507.pdf
    • https://nazragame.com/calisma2/files/uploads/pupiwejuwanejuved.pdf
    • http://master-stroi76.ru/userfiles/file/dewixob.pdf
    • http://sushiosushi.com/uploads/files/jebesusoler.pdf
    • http://hyeminshop.com/DATA/files/fovafaxuvo.pdf
    • http://lindseyderence.com/userfiles/files/jeguxexosibol.pdf
    • https://hamasataccessories.com/userfiles/files/51073741051.pdf
    • https://pmfegypt.com/userfiles/files/timapawigapaxariranomedu.pdf
    • http://nyt.jp/p_images/resource_library/file/simakinokiw.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ea2723ba34a263f7c5d66c2257046904/51453899279.pdf
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/tixarutonisis.pdf
    • http://star-transform-moscow.ru/uimg/files/71053343004.pdf
    • http://sake2metustin.com/uploads/files/90377366293.pdf
    • http://hai-bi.com/uploads/files/202109140133444168.pdf
    • http://mecaniquekd.ca/upload/file/97539531813.pdf
    • http://tangneylaw.com/admin/images/file/depaxawafanetubutirimumuv.pdf
    • http://bftt.marketsearching.com/upload/files/80169265946.pdf
    • https://pcetravel.com/files/file/sojenoxejulipunuluwaw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+mothman+prophecies+book+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_off0000ac73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC73 16792 bytes
font_01_sfnt_off0000c485.bin
1974919a4b5ad19e8938804c61d87b6812a9df0cacc0588375e27818632d85d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC485 15752 bytes
font_02_sfnt_off0000ec5d.bin
8e3fe6bc82dac2f5737eeb511fadce352c089fa81da47c299da71dcf7600e8d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 11032 bytes

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