Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec071651863dbc7…

MALICIOUS

PDF

76.2 KB Created: 2021-03-01 00:07:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fbf302b8e0cba19f43d536a0cf18e0b9 SHA-1: cb98f70e5b52675fbd70f8bde6adfba0ab6df11c SHA-256: 3ec071651863dbc78d9e590430444609a67d9860028449f7927a3c2ab8cf8064
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 URL that mimics a search result, likely intended to trick the user into visiting a malicious site. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URL.

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://zajinet.ru/strik?utm_term=acorn+stairlift+reset PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404983/normal_5fc73c2092607.pdfIn PDF document text
    • https://cdn.sqhk.co/kerosumumato/jgfaAt0/ironmaster_dumbbells_120_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416796/normal_5fd200243f1ad.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/e5iahMM/33425490384.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/android_phones_under_30000_in_nigeria.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/commercial_cleaning_checklist_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/35174689111.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/bdr_pharma_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/fifemabozoxowe.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/husky_power_washer_1800_psi_smart_pressure_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/bubozosuduwelevi.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/fojerelukarikepuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/netgear_wifi_extender_manual_ex6100.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/cambio_climatico_en_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/15025050825.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 4652 bytes
SHA-256: 804020e25a6bd3797f60ddcbe6f24e8f6c617c019b4a78a2a5d3b211756fd7b3
font_01_sfnt_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 10596 bytes
SHA-256: d78e2c1c21d5d742a89d3d9fa49d18f30fa9af15c9189e59e98ac6595bd260b1
font_02_sfnt_off000114a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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