Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fa790cb875ed21…

MALICIOUS

PDF

84.3 KB Created: 2021-04-19 15:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bbaeb9b0e81eeb84b89183a0f44fa14 SHA-1: d86fbefe451bb3fab03278a9ba47ad00e4332f7b SHA-256: 87fa790cb875ed21e7e209a81f31feba53244926bccbeb270371aaee4045a2ae
116 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific ClamAV detection name indicating it's a phishing trojan. The presence of an external URI pointing to 'dafemum.ru' strongly suggests a phishing or malware distribution attempt. While the document body is heavily obfuscated, the heuristic firings and the external URL are sufficient to infer a malicious intent to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://dafemum.ru/strik?utm_term=winningham%2527s+critical+thinking+cases+in+nursing+solutions+pdf
    • http://nizuxep.iblogger.org/43793675431.pdf
    • http://viziziziv.mywebcommunity.org/airman_exam_syllabus.pdf
    • https://cdn.sqhk.co/rajexizeba/MhiPXKn/racecraft_build_and_race_download.pdf
    • https://cdn.sqhk.co/joxipadij/hgidhfv/setesogaruluzezir.pdf
    • https://cdn.sqhk.co/zarejesorufo/fhijhaH/kekejamurijufolinu.pdf
    • https://cdn.sqhk.co/puburikob/5JHcnPZ/comment_scanner_un_qr_code_avec_iphone_8.pdf
    • http://kawafopi.mygamesonline.org/anaesthesia_drug_doses.pdf
    • https://cdn.sqhk.co/duxadikoti/cjcyfVI/moist_vanilla_cake_recipe_using_cake_flour.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lakiver.epizy.com/beaver_builder_free_plugin.pdf
    • http://revudipepofaten.myartsonline.com/can_a_paper_shredder_overheat.pdf
    • https://uploads.strikinglycdn.com/files/3f34f370-d51d-4b4b-a720-1e63c894ad6c/14576237421.pdf
    • http://dilutevanu.epizy.com/48478711331.pdf
    • http://rosesuvoker.epizy.com/paolo_bertrando.pdf
    • http://nelojodopon.epizy.com/zubufimiwukirepolezafas.pdf
    • http://vonizevugopu.rf.gd/50261306177.pdf
    • http://leguliwopubagu.epizy.com/signos_y_sintomas_de_insuficiencia_cardiaca.pdf
    • https://uploads.strikinglycdn.com/files/30ed7cb3-2099-4518-a444-66a876e200c2/polk_audio_magnifi_max_sr_troubleshooting.pdf
    • http://tosivasode.epizy.com/gl5537_photoresistor_datasheet.pdf
    • https://uploads.strikinglycdn.com/files/a4418a73-ec92-456c-ac7b-39d20e7b08dd/going_down_in_la_la_land_full_movie_free_online.pdf
    • http://tepojeno.epizy.com/ethical_hacking_tools_list.pdf
    • http://doxokalisawe.myartsonline.com/hand_embroidery_designs_free_download.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_off00010463.bin
546c2c5d610584c60a31ffb8c63c5070bf8bf259a575a6e66bb9489e5013becb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 5680 bytes
font_01_sfnt_off000117a8.bin
1e01047dcffe6c403d964608051ce40feaa8a947cd345760a4213785457ca3b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117A8 13376 bytes

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