Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f25bd56ba98a58…

MALICIOUS

PDF

76.8 KB Created: 2021-03-16 09:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ff335d4f52fdc0e7c309e0e702dc0e2 SHA-1: 4fa7d9d871ead8b5dd0f653a7ca75e5cbc08f297 SHA-256: 31f25bd56ba98a589d550ce5d21306c1ce81361f2c92dd705c7e15f7a34856b4
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an external URI pointing to a URL that mimics a search query for educational materials, likely a lure to trick users into clicking. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=punctuation+exercises+with+answers+pdf+grade+4
    • http://souve.me/sunasobtcrq.pdf
    • http://tezuveripoxub.mypressonline.com/fibakifaximuf.pdf
    • http://taxevidel.medianewsonline.com/lijamewefodirujegaton.pdf
    • http://zesamoa.online/jetaforixogatujatepaxx8bke.pdf
    • http://kowojolajamuv.getenjoyment.net/80884691171.pdf
    • http://50offstore.info/nubaxapebirasemebpdlyu.pdf
    • http://sepoxudozixo.sportsontheweb.net/the_book_of_job_in_the_bible.pdf
    • http://lifolibi.sportsontheweb.net/what_is_chi_in_medical_terms.pdf
    • https://tedowinoni.weebly.com/uploads/1/3/5/3/135304389/993995.pdf
    • http://gisoboxizaza.mygamesonline.org/survival_kit_items_for_natural_disasters.pdf
    • https://gisonegeviwobi.weebly.com/uploads/1/3/1/3/131383673/luxibawavugaxaleluka.pdf
    • http://gejokakop.mygamesonline.org/41579489539.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/luworizesupox/boss_2_full_movie_hd_720p.pdf
    • http://futebowa.atwebpages.com/70543530754.pdf
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_49b76fbd35254879876d3b5b28847930.pdf?index=true
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_1f7b2c61c8f745d195723c33f55d0fa4.pdf?index=true
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_0079b7625fca4906aafb1484278337a5.pdf?index=true
    • https://s3.amazonaws.com/wogikokuzotaxa/audio_recorder_and_editor_android.pdf
    • https://s3.amazonaws.com/wovugi/fexid.pdf
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_14468f18a2cd47f0a20d340d3d87327e.pdf?index=true
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_6470e2732798422697b66210d1d3e42b.pdf?index=true
    • https://s3.amazonaws.com/ratixifo/22190863431.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_off0000ed34.bin
633f693b332a8e8c2ec77155b4f15c757c9455105d3df9e80aea095289d0ae43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 5636 bytes
font_01_sfnt_off0001007d.bin
71c03c43acf078334c3833387eafcf4befb2722f3a77e8b6b3db792d61ae18ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 11008 bytes

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