Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8a31fffa5f0451…

MALICIOUS

PDF

77.6 KB Created: 2021-06-02 17:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 219dbfc69a66b57f90efebcd807c97cb SHA-1: 7ef5eb302e683027af7823dd033744df485aab57 SHA-256: 6b8a31fffa5f0451de0c1157a169b34c8ede06317c2809e4c7744b86277ee2d7
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a lure to download further malicious content. The document body, though heavily obfuscated, contains references to 'deped tambayan grade 1 worksheets', aligning with a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/pbw?utm_term=deped+tambayan+grade+1+worksheets
    • https://natesikapepik.weebly.com/uploads/1/3/4/7/134750077/sogemadilen-nepabifabufu.pdf
    • https://nebegixemavo.weebly.com/uploads/1/3/4/3/134359619/zodobil.pdf
    • https://bimevaxufozuz.weebly.com/uploads/1/3/2/6/132683359/2280649.pdf
    • https://fugofululedu.weebly.com/uploads/1/3/7/5/137515284/zedopo-pibaz.pdf
    • https://cdn-cms.f-static.net/uploads/4468253/normal_6049e664de443.pdf
    • https://cdn-cms.f-static.net/uploads/4406516/normal_601bd00317ac9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rixepal.pbworks.com/w/file/fetch/144505548/how_to_calculate_selling_price_with_fixed_cost_and_variable_cost.pdf
    • http://jeselivid.pbworks.com/f/xusuwuwolobove.pdf
    • http://lulimogosan.pbworks.com/w/file/fetch/144509049/how_to_write_a_petty_cash_book.pdf
    • http://zigunef.pbworks.com/f/kitchenaid_superba_microwave_oven_combo_repair_manual.pdf
    • https://uploads.strikinglycdn.com/files/e7da725d-353b-4c30-8ef8-6f692dd7aa0e/46457571658.pdf
    • http://nikekuva.pbworks.com/f/how_do_i_retrieve_a_deleted_voice_memo_on_iphone_6.pdf
    • https://uploads.strikinglycdn.com/files/9fec51c7-27ce-41fb-a60a-80df45114368/60162546360.pdf
    • http://xojifot.pbworks.com/f/super_smash_flash_2_unblocked_663.pdf
    • http://kelivesas.pbworks.com/w/file/fetch/144438600/36429065678.pdf
    • https://uploads.strikinglycdn.com/files/9aef8b27-efb2-449f-8899-e4f1ef8c10a8/ravamulirora.pdf
    • http://xutosop.pbworks.com/f/91277970684.pdf
    • https://uploads.strikinglycdn.com/files/1be4b061-0512-444c-a736-647329f216cf/pifemuwakupilaxibedemuvog.pdf
    • http://depowota.pbworks.com/f/nejuxifawufe.pdf
    • http://zezimin.pbworks.com/f/jesepinosowimo.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_off0000ed47.bin
2809699ac574b25d9127bcabbd26e86ab5e57720a4d2144d70608b2bc86a5371		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 5788 bytes
font_01_sfnt_off000100eb.bin
299182c1ad7d1e2d56477c4dff87c17da6fd4448b2c3f43433247f5b8d79a44a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 11688 bytes

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