Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c6d4cc662ed51f…

MALICIOUS

PDF

98.3 KB Created: 2021-03-05 12:11:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c3b63ad7034297fde609305b7d1f30f SHA-1: 6cebbb7bd426bb6fc701d464b8f033cfab71e07f SHA-256: d1c6d4cc662ed51f6e6cae445142cdf4f6b2e0b52472ae6498625b9db17cc79b
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm and a phishing lure, with a high ML score and ClamAV detection confirming maliciousness. The embedded URL 'https://jacksth.ru/award?keyword=is+advaita+vedanta+true' is likely part of the phishing attempt to trick users into believing they have won an award. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://jacksth.ru/award?keyword=is+advaita+vedanta+true
    • http://wodekenizowa.getenjoyment.net/udi_u818a_plus.pdf
    • http://nefuzixitelu.iblogger.org/85650661462.pdf
    • https://cdn-cms.f-static.net/uploads/4476302/normal_601711f97b143.pdf
    • http://bumumapa.mypressonline.com/echo_srm_230_brush_cutter_kit.pdf
    • https://static.s123-cdn-static.com/uploads/4469834/normal_5fe35c8795ff4.pdf
    • https://static.s123-cdn-static.com/uploads/4374956/normal_5ff3f8a081dc2.pdf
    • https://cdn-cms.f-static.net/uploads/4369922/normal_6036d5d34c546.pdf
    • http://woxuruko.medianewsonline.com/autocad_training_report_download.pdf
    • http://bogavevi.22web.org/14281111233.pdf
    • https://static.s123-cdn-static.com/uploads/4463526/normal_6007020af05fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • http://vamuxusonepuf.rf.gd/vinarilaral.pdf
    • http://vugikalijuboxo.epizy.com/audio_new_song_dj.pdf
    • https://uploads.strikinglycdn.com/files/7cc7d923-a33a-473c-a53f-231cc28feb9c/samsung_sm_t230_tablet_android_update.pdf
    • http://rixuzomobe.epizy.com/como_fazer_assinatura_digital_em.pdf
    • http://tilixufevoj.epizy.com/81411661087.pdf
    • https://s3.amazonaws.com/jifesu/child_dance_video_song.pdf
    • http://vowojuxibaxo.myartsonline.com/liwotonud.pdf
    • https://s3.amazonaws.com/xixonu/averta_semibold_font_free.pdf
    • https://s3.amazonaws.com/gafedupeba/lost_at_sea_movies_netflix.pdf
    • http://bikukasosisado.epizy.com/free_bearshare_music_s.pdf
    • http://timojodabemisux.myartsonline.com/35659319229.pdf
    • https://uploads.strikinglycdn.com/files/58565a14-9ce7-41c9-8c62-3a4846f071b8/analisis_del_libro_enamorate_de_ti_walter_riso.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://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dd1.bin
80d889f3d87afab9a7b9ebfefff2cbd258e07914e099ee0a88f077cb3fc37ad3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD1 4556 bytes
font_01_sfnt_off00012d40.bin
b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D40 3720 bytes
font_02_sfnt_off000138a3.bin
926114e9edb96dd7289fdd903edcb519251e80ef25d821233a0bcdec49198f75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138A3 10612 bytes
font_03_sfnt_off00015cfe.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CFE 4324 bytes
font_04_sfnt_off00016aff.bin
8798fec8e1d30ab550f1f2f4daf6db2c1201b38376484e227477dfa06c8a6fa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16AFF 4164 bytes

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