Malicious PDF — malware analysis report

Static analysis result for SHA-256 0731d4569861f714…

MALICIOUS

PDF

76.4 KB Created: 2021-04-21 17:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2cb50f74b319b583f28844c0f36b919e SHA-1: e56fdf5e0de28552268045eea9d7ad1c8a72ff1b SHA-256: 0731d4569861f714ab49109dc15cbc623d6bf04e97a4a7395400824102db01b9
96 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, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely for phishing purposes. The document body, though heavily obfuscated, suggests a lure related to a 'food chain worksheet'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=food+chain+worksheet+pdf PDF link annotation
    • http://2020coupons.info/tacky_the_penguin_coloring_pagesfhbp4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461777/normal_5fdfc8ce92534.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473890/normal_5fda6618a03ac.pdfIn PDF document text
    • http://torchqbfl.fun/kizerk5dmq.pdfIn PDF document text
    • http://creditreportus.info/how_to_be_an_amazon_writer62g7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458840/normal_605d88d7a5bed.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/12642140810o0so0.pdfIn PDF document text
    • http://anarchymedya.com/pistol_spread_offense_playbookdd7b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/medea_and_other_plays_euripides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16084835-3d64-4146-8558-a1985ea3b042/formato_de_avaluo_de_obras_de_arte.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf664b53-eac5-4d45-b0c2-af7c7fce4384/what_is_descriptive_writing_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/playstation_gold_wireless_headset_ps4_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/electric_current_class_10_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/70045221969.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/18698275313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c85b161f-96d2-4da1-89fa-5ece6e02cea2/jujipixojilu.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/cirque_du_freak_movie_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/braille_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/resumen_de_anemias.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 5324 bytes
SHA-256: eacd332eb3c67643e581e7432a975c3e95a6dec07b67486b4d5a9e61dec3ca2d
font_01_sfnt_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 11080 bytes
SHA-256: 5e917e28bce6e04b9e38bfd58e063fd7c30d75beab1423f9603eaa20669cc15f

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