Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bed849142e94cc8…

MALICIOUS

PDF

83.2 KB Created: 2021-09-15 15:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06b9a3e74751f5b6d8c48b5bfb91339d SHA-1: 75e6b4ce125939e581b6ffb111c5921fe95c6bec SHA-256: 3bed849142e94cc8791e0a38529dcbbb1d14cedf0842ba9f0eeed283925d5fea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one specifically pointing to a URL containing 'picsapp+photo+editor+pro+apk', suggesting a lure for a potentially malicious application. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting a malicious intent. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=picsapp+photo+editor+pro+apk
    • https://westhigienia.hu/editor_up/99980472347.pdf
    • https://fiberglasssupplydepot.com/userfiles/files/lomiroturanegojati.pdf
    • http://oletrans.sk/editor_uploads/files/tavesewibesaga.pdf
    • http://bukharaalpharetta.com/sites/default/files/file/19490564558.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613baab3b6fd9---70656836997.pdf
    • http://administratieindex.nl/images/uploads/80893660718.pdf
    • http://sinostandards.net/upload/files/63673333632.pdf
    • https://giga-tronics.com/userfiles/files/nosedovaxezizos.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/zomunepanagitexiwofusado.pdf
    • http://secretinvitation.net/images/files/70109629594.pdf
    • http://annabarons.lv/files/files/jofor.pdf
    • http://le-nora.com/userfiles/file/mivaziwowekukupalomilaso.pdf
    • http://explosivedevices.ru/media/file/19776611773.pdf
    • http://ave-france.com/pics/files/wuzibugasedugotu.pdf
    • http://maschimaurizio.it/userfiles/files/lapinakebodojijibutemin.pdf
    • http://houstontca.org/Content/uploads/files/takabepokalebeletofimova.pdf
    • http://geyikkimya.com/userfiles/upload/file/malovolubojilatekakex.pdf
    • https://turdv.ru/SITE/files/editor/file/739499111.pdf
    • http://retailcop.ca/files/noruziwagigadetopetazof.pdf
    • https://ykitraders.com/UserFiles/file/nizupulogu.pdf
    • http://innovad-ltd.com/userfiles/file/kubajetaju.pdf
    • http://bluebiz.kr/userData/board/file/31459418080.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/vurokawizolewanovajoj.pdf
    • http://rzn-house.ru/upload/file/40001386889.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_off0000dec0.bin
0903d5c0c49104023321276c2877902d760af130d1aaddfe89f9289e8329db9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 18288 bytes
font_01_sfnt_off00010e95.bin
84e2f908c412eecacfe92a4ac3b0a00ef35e0278def2f2d6bc4a49c6c5f31c78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E95 10552 bytes
font_02_sfnt_off000126d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126D3 16792 bytes

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