Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f70f6b8d1a6cff1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 05:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23e52b658f9dac45aa04b275e1bf32a8 SHA-1: 9d7eaf0784edaa192db74d0a87f23dd505554137 SHA-256: 7f70f6b8d1a6cff14a15d7006954eb5fb08354667fbde129d31314648c633464
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The PDF contains a large number of embedded URLs pointing to various domains, indicating it functions as a link farm. The presence of numerous unknown reputation URLs suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://rapet.hu/files/98044347735.pdf
    • http://triple-a.co.th/ckfinder/userfiles/files/rafufudujunazobo.pdf
    • http://bbhshipyard.com/userfiles/file/55849173347.pdf
    • https://gdaniec.com/upload/files/65381240907.pdf
    • http://beverly.kopanramen.com/uploads/files/74636939450.pdf
    • http://miwon.com.vn/app/webroot/uploads/files/29731098295.pdf
    • https://blokhol.com/upload/files/gilisafatusefubuv.pdf
    • https://elsadaulte.com/ckfinder/userfiles/files/puzimefozo.pdf
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/38119664022.pdf
    • https://ladangmimpi.com/contents/files/gepaberoloxobobim.pdf
    • https://beldapin.com/calisma2/files/uploads/69843683817.pdf
    • http://autoklej.pl/app/webroot/media/files/kudez.pdf
    • https://robustbrakes.com/administrator/imagetemp/file/48387515813.pdf
    • http://ahnil.com/userData/board/file/pomasukumagexizejazoz.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/nkaoe5go2bqq2eqg0tre5ur2ag/lalerinumowilorapar.pdf
    • https://rumputhijau.com/contents/files/kebodumolomiku.pdf
    • http://theorientgarden.iorderfoods.com/uploads/files/zarisejuxazutawozajemibu.pdf
    • http://csc0512.com/userfiles/file/20210911223653_73vylu.pdf
    • http://rideco.hu/upload/file/vumaxorifarojupukavo.pdf
    • https://neurondevelopment.org/userfiles/file/94438805402.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/xugumisonezopemufa.pdf
    • https://saleskerala.com/ckfinder/userfiles/files/fikazutevapuxezamajo.pdf
    • http://fc-junajted.com/upload/datoteke/kubolujubikafixamatol.pdf
    • http://lhdrum.com/User_File/UpFile/file/20210921061831_eG93ZWZpemVkYWY=.pdf
    • http://ersenergy.com/UserFiles/file/sunudiwazenonodazugo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=slugterra+dark+waters+apk+download
    • 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_off0000d54f.bin
940b69ccc63ce8ecba16006748370e8642e50555b2f3bdf24b1321c24f35f7f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 10828 bytes
font_01_sfnt_off0000ee51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 16792 bytes
font_02_sfnt_off00010663.bin
f7efb0a77857defef8bfeb4d7bb207580bbc73ee54cfb38a232d550fa56a1214		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 18028 bytes

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