Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc40b084f23ced8…

MALICIOUS

PDF

107.0 KB Created: 2021-03-30 04:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 550f0b198fe601aeb68d2170352a305b SHA-1: 33ceb3ae2015398bce74716645a56d1105d467c0 SHA-256: 1fc40b084f23ced831b9406ac55fd3d3e2e3a993e7d3e035f63f1ac05a058bcf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious domain ('xezojetit.ru') that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF structure suggest it's designed to redirect users to malicious content, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/aws?utm_term=proton+nmr+spectroscopy+slideshare
    • https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/2541957.pdf
    • https://cdn.sqhk.co/susojitigi/cwegdyu/okc_thunder_logo_vector.pdf
    • https://vorupegesozuzow.weebly.com/uploads/1/3/1/4/131453293/vivujol.pdf
    • https://redojakora.weebly.com/uploads/1/3/2/6/132682723/1b69cb680ee059.pdf
    • https://cdn.sqhk.co/woledowo/nhdjjgf/luxijerener.pdf
    • https://cdn.sqhk.co/numokafas/xjigcDK/6793468880.pdf
    • https://cdn.sqhk.co/tejilunuf/TMCietI/star_girl_fashion_cocoppa_play_mod.pdf
    • https://cdn.sqhk.co/rinovizifim/ujiUggE/jardine_bird_sanctuary_chicago.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gudukupir/constitution_test_study_guide_8th_grade.pdf
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_32a65a56a3134522a06c7a1ba43cf9ed.pdf?index=true
    • https://s3.amazonaws.com/jiwisi/60702601788.pdf
    • https://s3.amazonaws.com/kewakuko/bose_soundsport_free_manual_espaol.pdf
    • https://e6343aec-df69-40e7-9959-3c0c55bf73c9.filesusr.com/ugd/6a9017_fbce5cfe552842c787ef1f2cbd7aee3e.pdf?index=true
    • https://s3.amazonaws.com/laradusa/gomitekomizuw.pdf
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_8c0bf2d7a4d247a28a7f1bd7d58a6f8f.pdf?index=true
    • https://s3.amazonaws.com/salade/1495542599.pdf
    • http://tejujusaruke.epizy.com/96439616154.pdf
    • http://sowukosififu.rf.gd/renipup.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b1f.bin
d42059d57b07f1f4d3741172d19129542d171955b75b914d0ace3532b0896caf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1F 5816 bytes
font_01_sfnt_off00015eff.bin
afed35b13e50df2798f2c4146f909ab3cfcad2a364a0d7b08ce4f8412a8973c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15EFF 5416 bytes
font_02_sfnt_off0001713f.bin
061ace5538cb5a46318a5dab249deea4e3cdc443be155f8818060fe5e05ad8d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1713F 13384 bytes

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