Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc0fce432c93777…

MALICIOUS

PDF

72.2 KB Created: 2020-12-17 22:23:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d4395453aedd04b1a081758c61e66be2 SHA-1: 76ab3a6b5c8afd84a3f641ad20e8d3a6b0d661af SHA-256: bfc0fce432c9377714d4a13659707ec6e9fb41df9e8a80fc7b553fdb68175b53
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URL, 'https://traffnew.ru/aws?utm_term=possessive+nouns+and+pronouns+worksheet+pdf', which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a 'possessive nouns and pronouns worksheet'. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URL.

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://traffnew.ru/aws?utm_term=possessive+nouns+and+pronouns+worksheet+pdf PDF link annotation
    • https://segelibuvak.weebly.com/uploads/1/3/4/4/134451144/fuwatamawinigot-fewokogisodenek-dakaxaguvibez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5fd3b4472aca7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413468/normal_5fae5290ee005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386594/normal_5f9e15a2a97c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408990/normal_5f9383ae71586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380405/normal_5f9a30905ada7.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/pujadozixej_wokanozi_muwako_lopis.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://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0a00f8cdb769c6aa53a4/1606289921172/91243127310.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b3a8405d5340f34a87f2/t/5fc75bc37995075abde2d531/1606900675801/final_fantasy_16_trailer_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfc326a371610b87776be/1606220851356/sony_sound_forge_pro_11_serial_number_17d.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0be4612facd59ceac2d5b/t/5fc13ad51972c46e3ccb30f9/1606499029319/77514312719.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5181abe9b69395125e644/t/5fc78a455fecd2174b62a77b/1606912581774/easy_pay_wallet_app.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/manga_smithmicro_updates.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/6308220778.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_off0000d00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00C 5196 bytes
SHA-256: f01ddf92d35b82119c8d195530fda47cf265f7ae036f6ac98624be49dcf22f86
font_01_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 10452 bytes
SHA-256: 3ba00eeb73922553fa9c78c637c252e493680a611eb93296889f4924b1a269c6
font_02_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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