Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70a5a492f04aff8…

MALICIOUS

PDF

87.1 KB Created: 2021-01-21 12:53:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 22be4e3d752aa4271cc69c6ee49a9f25 SHA-1: 6e0cce71126ddef37ebb273ece93a1c91c8eba57 SHA-256: f70a5a492f04aff8ead44e3d89b1c9b2e7ddffa45f7475460b906a7a7c76f57d
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URL that leads to a domain associated with phishing, disguised as a guitar chords chart. The PDF structure itself is also flagged for duplicate object bodies, indicating potential obfuscation.

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://traffine.ru/aws?utm_term=guitar+chords+chart+pdf+for+beginners PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374968/normal_5f8f1885c7e9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413122/normal_5f9de94f510cc.pdfIn PDF document text
    • https://site-1168513.mozfiles.com/files/1168513/23636778036.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378170/normal_5fce474594912.pdfIn PDF document text
    • https://site-1196780.mozfiles.com/files/1196780/demographic_transition_model_stages_1-_4.pdfIn PDF document text
    • https://site-1177727.mozfiles.com/files/1177727/mosarefeteludubux.pdfIn PDF document text
    • https://site-1196632.mozfiles.com/files/1196632/grail_knight_vermintide_2_challenges.pdfIn PDF document text
    • https://site-1246927.mozfiles.com/files/1246927/chess_game_for_ipad_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_5f91e2529ec49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gedaseda.rf.gd/mid_android_tablet_9_inch.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/37212536991.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/chest_vte_prophylaxis_guidelines_2018.pdfIn PDF document text
    • http://wotujemun.rf.gd/rrb_alp_answer_key_2018_gradeup.pdfIn PDF document text
    • http://dusiwesidixe.epizy.com/polunijejodituge.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/22654205178.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/disizarubuwufovego.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/53824765317.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_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 5556 bytes
SHA-256: ad8f5579af37856d84ffe1891fa604efd760c1cfe956ddf4af3631c4b8e3f870
font_01_sfnt_off00012807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12807 10856 bytes
SHA-256: c6c3cdc9ce06f337b9160e37da3d44d404e9c1df0ceeea39dda8d3c81dc48a6e

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