Malicious PDF — malware analysis report

Static analysis result for SHA-256 87764c34076fe63c…

MALICIOUS

PDF

74.5 KB Created: 2021-04-06 04:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f70dca9ad4297a4d4146a7a10f9c9ac2 SHA-1: bd970c34cda16757a2db0baad26e6e791511c11c SHA-256: 87764c34076fe63ca6a8906aaa7ad73c70a30f12c9708d20348701ff1b1b1ab1
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to educational content, a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://dafemum.ru/wix?keyword=arcs+central+angles+and+inscribed+angles+worksheet
    • http://rexuwoxaga.sportsontheweb.net/vujebamewamori.pdf
    • http://fodekofuxuvum.sportsontheweb.net/92313266423.pdf
    • http://ferafukapawap.scienceontheweb.net/free_english_classes_for_immigrants.pdf
    • http://neridofufuleteg.scienceontheweb.net/48157857233.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wotadizadupi.epizy.com/64414783524.pdf
    • https://s3.amazonaws.com/wovitiku/soya_bean_production_guidelines.pdf
    • http://fudapigoxuwumu.rf.gd/13783422681.pdf
    • http://wokakasav.onlinewebshop.net/mawegafawipe.pdf
    • https://s3.amazonaws.com/nutanigonu/17177151911.pdf
    • https://s3.amazonaws.com/pobixedele/61569558388.pdf
    • http://xagexof.rf.gd/actemra_fda_prescribing_information.pdf
    • https://s3.amazonaws.com/pulujolatepuv/movapixubenosekulikekinu.pdf
    • https://s3.amazonaws.com/roxawo/ludowogonedavino.pdf
    • https://s3.amazonaws.com/lupuvogotog/dwg_viewer_android_app.pdf
    • http://gexazovaf.epizy.com/misal_romano_tercera_edicin_mxico.pdf
    • https://s3.amazonaws.com/vebenok/marie_antoinette_film_1938.pdf
    • https://uploads.strikinglycdn.com/files/82346a2a-a8ad-418f-a651-3c57d05d9400/honda_9.9_outboard_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/de6c1600-3bc9-463b-aaaf-fb9bcbc5c921/how_old_is_ben_parish_in_the_5th_wave.pdf
    • https://s3.amazonaws.com/rutufokedizon/jibafisidaxukuser.pdf
    • https://s3.amazonaws.com/legipalofi/share_chat_games_video.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/is_fisher_and_paykel_worth_the_money.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_off0000e361.bin
ec4fdda1947a53cdd5db9290eefaece711629340f4bda70062d35d0a96b7969a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 5484 bytes
font_01_sfnt_off0000f60e.bin
7efe0f62e884447f6c23e44ec469242cbaf41eb533ed856c492b485e653dee65
pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 11472 bytes