Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de032814f3a6779…

MALICIOUS

PDF

77.7 KB Created: 2021-03-23 10:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b36849462aa9582a3f9bf5147a36ced9 SHA-1: df4fda6956368bc042aa25376bf7dd7c4f4bbd9f SHA-256: 4de032814f3a677993a7d9408e2948092dac8206f720c4c85d65c8b5ce906ef2
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'resalured.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'past simple tense sentences' and authoring information, suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=past+simple+tense+sentences+pdf
    • https://cdn-cms.f-static.net/uploads/4476941/normal_6011458a2ee14.pdf
    • https://kamefumude.weebly.com/uploads/1/3/4/0/134018396/ditono.pdf
    • https://dotofinadi.weebly.com/uploads/1/3/0/7/130740455/5766945.pdf
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/xojol.pdf
    • http://fejekadiwoxobiz.getenjoyment.net/ketiwowagizigagokex.pdf
    • http://budivev.scienceontheweb.net/how_to_read_a_lowrance_hook_5_fishfinder.pdf
    • https://fojugifobuko.weebly.com/uploads/1/3/5/3/135328464/zazukikupelogadapa.pdf
    • https://logutidukikov.weebly.com/uploads/1/3/1/3/131380383/1522688.pdf
    • https://cdn-cms.f-static.net/uploads/4370304/normal_6059684247780.pdf
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/biwejo.pdf
    • http://tigafik.mygamesonline.org/pizenoxa.pdf
    • https://cdn-cms.f-static.net/uploads/4475853/normal_602d9f772d6a9.pdf
    • http://kakorezikudu.mypressonline.com/possessive_nouns_worksheets.pdf
    • http://bawimip.sportsontheweb.net/scrambled_sentences_sight_words.pdf
    • http://gojawufeki.getenjoyment.net/58030215570.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rudelazifizuvo/block_breaker_3_apkpure.pdf
    • https://s3.amazonaws.com/jesidofefe/the_firm_book_movie_adaptations.pdf
    • https://s3.amazonaws.com/dumupa/zutoxegedagemomufupurud.pdf
    • http://wobanunep.myartsonline.com/excel_vba_get_rows_in_table.pdf
    • http://nejesezape.myartsonline.com/26810634544.pdf
    • https://s3.amazonaws.com/tinivukedeta/medizipopojokekasukap.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_off0000effe.bin
d147ffb953c32ff9491b57b6e5c53f8834b0ba036f6920bfe43a9325dbf319a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 5208 bytes
font_01_sfnt_off000101a7.bin
4d739cf6daa56dab727c24adfb8b78d947e9dc4927f0806474be364de30e934a
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 11256 bytes