Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1dc3e1a3ec3669…

MALICIOUS

PDF

88.3 KB Created: 2021-04-07 21:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5353a896a930d59f3a28feccd27aa19b SHA-1: b65dd99e2ef42e9775fbb333099eedab258cc7d9 SHA-256: cd1dc3e1a3ec36695e014a7d249b4cb7d6a6014adcde24d53c39b96c781733b1
136 Risk Score

Malware Insights

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

The PDF contains a heuristically identified random URL, indicating a likely attempt to direct the user to a malicious site. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of external URIs and the PDF structure point towards a phishing or malware delivery attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://botokaw.ru/aws?utm_term=what+are+some+examples+of+vegetative+reproduction
    • http://itanto.space/juxuduwatowijisodifilue4he.pdf
    • http://fitokaps.xyz/wopanitasidukifopigusazexnlfhf.pdf
    • https://cdn.sqhk.co/mepapogivoma/Rgfjdgg/lujozadexumu.pdf
    • http://cparta.moscow/painting_easel_michaels8af0j.pdf
    • https://cdn.sqhk.co/pujixefan/chbhgsn/11171880717.pdf
    • https://cdn.sqhk.co/gigatakel/drXhVgf/62130746511.pdf
    • http://musofiron.ru/tom_clancy_jack_ryan_moviesjrs3q.pdf
    • http://kersita.fun/vcf_file_to_converter_onlinekrhyt.pdf
    • https://cdn.sqhk.co/daxerarugak/hcjaoRg/wovubivorofanonuj.pdf
    • http://drive4mclanemilwaukee.com/time_word_problems_year_4_worksheetsiigde.pdf
    • https://cdn.sqhk.co/fovugemut/dgejigi/jigsaw_puzzle_template_2_pieces.pdf
    • http://ru-dev.xyz/xolukakowugezkm3v.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dd2b207a-4632-4f3a-aeea-bfc4a3cd3a2e/langston_hughes_harlem_summary.pdf
    • https://s3.amazonaws.com/lebaxa/59825883605.pdf
    • https://uploads.strikinglycdn.com/files/9c482a54-4d05-4d20-856f-cdbe2b6e5f52/how_to_find_area_and_perimeter_of_irregular_figures.pdf
    • https://uploads.strikinglycdn.com/files/b6e9af3d-b45e-4c31-9f16-f57f2d91b8fc/basic_guitar_chords_songs_hindi.pdf
    • https://s3.amazonaws.com/xarojapi/54048442533.pdf
    • https://s3.amazonaws.com/vuzufexarevima/novaromasejuwopasel.pdf
    • https://s3.amazonaws.com/fajeloninesitel/despacito_guitar_tab_sheet.pdf
    • https://uploads.strikinglycdn.com/files/b434a867-a75b-41c4-b975-493ebcc64542/8542608643.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_off00011b91.bin
2eae32c4b002235cc410e8f31af2b1e8fe6b0190694007151193a349d19efa0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 5708 bytes
font_01_sfnt_off00012eee.bin
88b82f6e6cf5d9861a1831957dfb0f00c1fd4363b24c32dfd97b54140b065bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEE 10748 bytes

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