Malicious PDF — malware analysis report

Static analysis result for SHA-256 915550e0cd2f3694…

MALICIOUS

PDF

79.8 KB Created: 2021-04-04 10:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 32cfba7948f96c0233087b97228e1d28 SHA-1: 5329eb0e86739b7433002b1f31c98448e9b86ab6 SHA-256: 915550e0cd2f3694649562aab16f4f0e446584d5cdfd6de8ba31c3193f2c48e2
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The document body text, though garbled, suggests a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=computer+hardware+and+networking+pdf+in+gujarati In PDF document text
    • https://fuviwamirami.weebly.com/uploads/1/3/5/3/135351498/dufokobufini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376382/normal_603f85f87f41f.pdfIn PDF document text
    • http://alcozerox.com/compound_subject_verb_agreement_worksheets_with_answerscfpjd.pdfIn PDF document text
    • http://verification-help.com/24410678950jsst5.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://lumolowopixu.iblogger.org/fuwisepobizamasifiwuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_60545573c0f04.pdfIn PDF document text
    • https://zisogojevup.weebly.com/uploads/1/3/1/4/131453725/d7504514.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468253/normal_5ffce42d97b7e.pdfIn PDF document text
    • https://kanudepu.weebly.com/uploads/1/3/2/7/132740929/5260190.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491426/normal_5ff81941288ae.pdfIn PDF document text
    • https://vabemeraronoj.weebly.com/uploads/1/3/1/4/131452983/8129741.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5ffd1303cf8d2.pdfIn PDF document text
    • https://kefelewupu.weebly.com/uploads/1/3/4/7/134711224/megagejegak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491432/normal_600c79cbb11b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426550/normal_6020a3b56f642.pdfIn PDF document text
    • http://immorta-cross1.club/71721991407ftc51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372384/normal_5ff26257c344c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4962fc-d0cd-45de-8a6a-031c91ed08c0/81109131603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/869afc9e-ff2d-40aa-b195-07bdf08d3d55/life-span_life-space_theory.pdfIn PDF document text
    • http://tagitefidunun.epizy.com/fusofubixosod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc0e7f8-f4b7-4c4c-9ac6-0c6f80170ca6/pedesuvebofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665faa07-826a-48d4-b1ca-67a0f775c8d2/32385595268.pdfIn PDF document text
    • http://parijuxurumemew.epizy.com/78625053068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ef5f55-34f6-4dd1-8262-108539adf9fd/22076481073.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 5384 bytes
SHA-256: 5a75a367b37f87674f3e4be421482714940127cf746c44021f890bb424f38e53
font_01_sfnt_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 11260 bytes
SHA-256: 90711f966313e3ffca329919a765bb42841a02ee8cb5763a5b01d1dae6f9fef7
font_02_sfnt_off000119d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D7 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e

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