Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04e3756077db33f…

MALICIOUS

PDF

90.5 KB Created: 2021-06-04 21:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02a039a9179d71a7608790ae07f00d43 SHA-1: 55d967e970ccf0edbc0bab7e64f9248fc1abb4e4 SHA-256: f04e3756077db33f2a927bef11a5737f8770f36a2f444489c92d1e09545d6280
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is likely used for phishing or malware distribution. The PDF structure and numerous links suggest it functions as a link farm, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/pbw?utm_term=what+are+your+hobbies+and+interests+best+answer
    • https://duwesokele.weebly.com/uploads/1/3/1/6/131606866/zelabegiduref-rutafexeseboxep-jigogokefujuk.pdf
    • https://static.s123-cdn-static.com/uploads/4454045/normal_5fdddbdbd9ea3.pdf
    • https://morinuzarisifuf.weebly.com/uploads/1/3/4/2/134234593/lomokaxirogiwed.pdf
    • https://wojaluzuzuduku.weebly.com/uploads/1/3/7/4/137498881/goxaxamumow.pdf
    • https://siresikewutawin.weebly.com/uploads/1/3/0/7/130739490/960f16a8cc723e.pdf
    • https://geworusidexaj.weebly.com/uploads/1/3/5/3/135306562/7297706.pdf
    • https://static.s123-cdn-static.com/uploads/4366033/normal_600730607949a.pdf
    • https://pefisidedufe.weebly.com/uploads/1/3/4/9/134902532/defebalumuzosogu.pdf
    • https://sotezogurew.weebly.com/uploads/1/3/2/7/132740991/9011583.pdf
    • https://pajilolupifi.weebly.com/uploads/1/3/2/3/132302794/lunedorimilogukebeme.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pukagij.pbworks.com/w/file/fetch/144560601/13620870913.pdf
    • http://katafuzum.pbworks.com/f/vumokosedab.pdf
    • http://lekipirunezi.pbworks.com/f/nikosox.pdf
    • https://uploads.strikinglycdn.com/files/e9a922a8-7230-4926-a857-9361943b779c/72532217607.pdf
    • http://felinemumivu.pbworks.com/f/juzedatilaboxe.pdf
    • https://uploads.strikinglycdn.com/files/adbdc102-3d64-4bdf-8b64-c0cedb46218e/zukakeledikapa.pdf
    • http://pefumugat.pbworks.com/w/file/fetch/144540111/92555496817.pdf
    • https://uploads.strikinglycdn.com/files/2d888082-605e-47fa-8b6e-5a3b651fd845/2879451815.pdf
    • http://siseraxoru.pbworks.com/f/bwv_1007_allemande_guitar.pdf
    • https://uploads.strikinglycdn.com/files/5833aebd-1215-4843-8d6e-55c377006d61/does_wendys_have_baconator_fries.pdf
    • http://zupelapowi.pbworks.com/f/how_many_calvin_and_hobbes_comics_are_there.pdf
    • http://mulasamesi.pbworks.com/w/file/fetch/144572715/guitar_solo_scales.pdf
    • http://bijinim.pbworks.com/w/file/fetch/144593757/10_ejemplos_de_oraciones_con_sujeto_predicado_y_ncleo_subrayado.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc6b.bin
0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 6744 bytes
font_01_sfnt_off00010d52.bin
ad1091d3a371ad4aa01148a05439a1ac5286d909dabd876d104004ca6eafb88e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 5228 bytes
font_02_sfnt_off00011f2a.bin
854dbd32b1cc202f1585600690388e471f45945b43f253a5266de1f38152af41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 10892 bytes
font_03_sfnt_off0001441e.bin
ed45a24507f18daeaf6b6e9cac20235e9e43bed88bc2d44b7621eff085e31190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1441E 16344 bytes

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