Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc2e29dcb93db8f…

MALICIOUS

PDF

80.8 KB Created: 2021-06-11 17:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dd5f6a2acda93263ff512fba7003f5f SHA-1: 7228844b1bfa95cca597605c49980145cdf1cdfd SHA-256: cfc2e29dcb93db8fddfaec4157ee02a111c3fffb65e0b8e3e7d9a8fa087870bc
164 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it is part of a link farm designed to distribute malicious content or phish for information. The embedded URLs and the PDF structure point towards an attempt to disguise malicious activity as legitimate downloads.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/pbw?utm_term=neet+most+wanted+biology+book+download
    • https://cdn-cms.f-static.net/uploads/4423757/normal_604ad5d97803c.pdf
    • https://rujivedudupuvi.weebly.com/uploads/1/3/6/0/136051492/tifemazovop.pdf
    • https://wovigapugup.weebly.com/uploads/1/3/2/7/132710676/4199159.pdf
    • https://cdn-cms.f-static.net/uploads/4409396/normal_602507238520f.pdf
    • https://static.s123-cdn-static.com/uploads/4449411/normal_5febbe2e737f3.pdf
    • https://cdn-cms.f-static.net/uploads/4495043/normal_6028bfec694ae.pdf
    • https://cdn-cms.f-static.net/uploads/4366406/normal_603779ec76619.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102Hussain
    • http://smc.org.inhttp://smc.org.in
    • https://uploads.strikinglycdn.com/files/62bc37f6-03a4-469f-9c17-f89b8eeb4511/ejercicios_para_sexto_de_primaria_matematicas.pdf
    • http://nalujoxerisi.pbworks.com/w/file/fetch/144662457/stoichiometry_worksheet_1_answers_key.pdf
    • https://uploads.strikinglycdn.com/files/34e2e3ea-f599-474e-b447-436cf6a4cbb4/mubotagiwuwegutipo.pdf
    • https://uploads.strikinglycdn.com/files/b535c6bc-233e-4a24-b66e-ff855385a2b1/47118729396.pdf
    • http://pusavivo.pbworks.com/f/valuwuboju.pdf
    • http://serizedez.pbworks.com/w/file/fetch/144599034/bopunitibanisidetu.pdf
    • http://vazesuna.pbworks.com/w/file/fetch/144506289/96824147205.pdf
    • https://uploads.strikinglycdn.com/files/09c97397-324b-4d50-982a-8383c88b86ec/a_grammar_of_motives.pdf
    • https://uploads.strikinglycdn.com/files/f7f0ec32-c27b-404a-bac8-5bd0144c6ecc/mantoux_test_result_duration.pdf
    • https://uploads.strikinglycdn.com/files/ecdc7011-dbe5-4a2d-a32e-34e17ac64e17/92115613916.pdf
    • https://uploads.strikinglycdn.com/files/4c53dfc0-0e84-46dc-b0b9-356686ac1c22/2120937840.pdf
    • https://uploads.strikinglycdn.com/files/ae033662-26dc-473d-8df5-5d1e6f79a030/what_is_stress_in_steel.pdf
    • http://zepadatoju.pbworks.com/f/62045824816.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
    • https://gitlab.com/smc/meera/blob/master/COPYING

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df01.bin
f351551e75d7a348f403f3c0640b66ba7c9765f6da32432c0140ef92f41e6057		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 5416 bytes
font_01_sfnt_off0000f16f.bin
d72a8b6f9c8a66bce16b9ad0dec2346ba625f0c56ca18f891894f9d5dbb6a5ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 4508 bytes
font_02_sfnt_off00010259.bin
b17c878e4389bc37131d23314004e051637468a2b9b6171fd873bbdc24766b0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 2884 bytes
font_03_sfnt_off00010e63.bin
b8556a34d430b02fec1d1d6680896265f2aa99f045f27c6fbbce3c82898276af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E63 11420 bytes

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