Malicious PDF — malware analysis report

Static analysis result for SHA-256 988ce46ba50759ea…

MALICIOUS

PDF

75.2 KB Created: 2021-03-16 14:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51e890760a4a82892ec8dd6fc6ed3203 SHA-1: 7d95d6ce3495d68dae1c46cd367d3f8dfac74159 SHA-256: 988ce46ba50759ea6dc961fbfccb7a681522a7888aecdb7d8256969057f9b7f2
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm, and is flagged by ClamAV as Pdf.Phishing.Trojan. The presence of a 'download' lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/award?keyword=mnemonica+miracles+pdf+free
    • https://cdn.sqhk.co/rotefuver/OdHDljf/bebepulagusotaserul.pdf
    • https://cdn.sqhk.co/sinemajud/dhcghdX/breadwinners_restaurant_northpark.pdf
    • http://giwapozolaleg.mypressonline.com/links_awakening_face_shrine_gameboy.pdf
    • http://bosnoslovnoejelaniekupit.xyz/problem_based_learning_activitiesrcm96.pdf
    • http://felesatediz.medianewsonline.com/angulos_na_circunferencia.pdf
    • https://soranetibipuve.weebly.com/uploads/1/3/0/7/130738631/451238.pdf
    • https://cdn.sqhk.co/magimoruki/6hbvMjc/69000659214.pdf
    • http://prizinsta24.space/6701049340hz2cr.pdf
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/712212.pdf
    • http://1xbets-reg.site/17046658877b00rd.pdf
    • https://xesanojazal.weebly.com/uploads/1/3/0/9/130968931/pepabini_fidik.pdf
    • https://cdn.sqhk.co/xamizine/aeiiTgd/residence_inn_las_vegas_nevada.pdf
    • https://gazezujebek.weebly.com/uploads/1/3/4/8/134881616/c845241b51.pdf
    • http://roselosudeve.sportsontheweb.net/81821780376.pdf
    • https://xezaresirut.weebly.com/uploads/1/3/4/7/134712286/8236424.pdf
    • https://cdn.sqhk.co/tuxonewebuke/Ijagfgi/nafadi.pdf
    • https://lezevonunibo.weebly.com/uploads/1/3/4/5/134577944/b4f31201.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://burerekel.rf.gd/annadata_bengali_movie_song_free.pdf
    • http://dusetelonuzaj.epizy.com/91037186899.pdf
    • http://lojosuxotugades.epizy.com/mawijapagesawaxavafu.pdf
    • http://rimamosapike.epizy.com/nijigituvoroligiwur.pdf
    • http://bakavifotegenol.epizy.com/acrobat_standard_dc_subscription.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e722.bin
5114bf3b047fc3011d9a9b3e2b739e987e2cbcac8682779cf1ac160b3f32a882		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 5304 bytes
font_01_sfnt_off0000f91d.bin
61d4709850403b72195d371ababa9e9a108af354346256236fc3168e3a693f8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 11476 bytes

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