Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08af1c06ea2cc43…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 10:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c71987c1e46a6bf9ae53b9154795d54 SHA-1: e1e9d3cc627df979c6be850753b73a2e7bc782c7 SHA-256: d08af1c06ea2cc43382902ce42a43925813fec94ef08b94928f9bb296446c30b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically pointing to a domain associated with a 'free fire skin tool' lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed to obscure malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://catamma.ru/uplcv?utm_term=free+fire+skin+tool PDF link annotation
    • http://www.scsk12.org/policy/files/files/sixazakebigefab.pdfIn PDF document text
    • https://kildevangen.dk/files/suvamowutamafitazobu.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/waburijazi.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/46363834481.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-24/20210924130058143897.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/zikunires.pdfIn PDF document text
    • http://ginkgokatsugg.com/uploads/files/xanunidikirojubetaxis.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumazovezexo.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/jexemibenegotudejoruw.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/wolanuzeno.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/51328304346.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/85205181243.pdfIn PDF document text
    • http://stefani.cz/fck/file/vagaruxatolarix.pdfIn PDF document text
    • http://dobosugyvedkecskemet.hu/userfiles/file/gotulozaxijituzezi.pdfIn PDF document text
    • http://lawngo.net/fckfiles/puxakazalimofez.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/sufulusabeveroga.pdfIn PDF document text
    • http://topstec.com/d/files/bapabufupalutipomufa.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/61267340291.pdfIn PDF document text
    • http://reichspfarrer.sk/file/11719180514.pdfIn PDF document text
    • https://finliz.lt/i/File/ribisofofog.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/62516676658.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/zinevaf.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/58760485178.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e4f71468f9f581ce7110e1a448f7a3e4/rifedajotoxakusoxofesemol.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/paxaberasomeluze.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/6980826695.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12A 15936 bytes
SHA-256: b526b0fbc84164cdf59f77df4f8d227baea7124c1ef79357b6e110d00ee0ec82
font_01_sfnt_off0000d9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 10112 bytes
SHA-256: a6a5f25c6a8eb87c48aac857e8af09d74a94ccabdb535c90182e3c95f8f0ebc8
font_02_sfnt_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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