Malicious PDF — malware analysis report

Static analysis result for SHA-256 a162fe4942516c58…

MALICIOUS

PDF

237.0 KB Created: 2021-04-21 11:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3dab211bf53c3e6d4835422ab2bfd49b SHA-1: 760391109e6c3045303d8c998ad4f626ad66de74 SHA-256: a162fe4942516c58177d66907c60d7bdb31e566d1aea28b0080bb15cfbcab7a6
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and ClamAV detected it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to educational content. The presence of multiple unknown URLs indicates a likely attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://jacksth.ru/strik?utm_term=parts+of+speech+in+english+with+examples+ppt
    • http://formverifiedbadge.com/famapufeperizawaqwcx7.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • https://cdn-cms.f-static.net/uploads/4414701/normal_602884dee4d87.pdf
    • http://sugameloxufe.mywebcommunity.org/rirosibanonofasakataz.pdf
    • https://cdn-cms.f-static.net/uploads/4486775/normal_603167bdddcb5.pdf
    • https://cdn-cms.f-static.net/uploads/4384164/normal_5fd639a0655a7.pdf
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5fe40d8eb72c3.pdf
    • http://zefutuwukeras.getenjoyment.net/vevaxutujit.pdf
    • http://wiinorama.fun/nero_8_ultra_edition_serial_numberjxkwb.pdf
    • http://csxmoney.info/kruskal_wallis_test_reporting8hc9w.pdf
    • https://cdn-cms.f-static.net/uploads/4374517/normal_60194e06421b9.pdf
    • http://salestore.pro/lerobotisiduv1xzez.pdf
    • https://cdn-cms.f-static.net/uploads/4501233/normal_6045036cc2e7a.pdf
    • http://nopotaz.medianewsonline.com/94150463165.pdf
    • https://cdn-cms.f-static.net/uploads/4377647/normal_601012c67e488.pdf
    • http://ruwazumusef.scienceontheweb.net/64768581894.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7a8ee0a4-77b6-4ecc-94a7-2e16cdec4cc6/68515005311.pdf
    • https://uploads.strikinglycdn.com/files/f0c6a3dc-c56b-44b0-8e6a-cad5ac7d6b13/why_does_my_att_u_verse_say_no_signal.pdf
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_2e3e298c7d59461b8798e458597f4a1e.pdf?index=true
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_376620161d7949eba4cc27f02535e913.pdf?index=true
    • https://uploads.strikinglycdn.com/files/adc37dc7-55dc-4d67-a433-8bbc91ec198e/collins_edexcel_international_gcse_biology_student_book_answers.pdf
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_2387a212962b4a7fa7bd72bb0b367852.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7bbe077a-f84f-4981-b775-5206e4a73542/94363783188.pdf
    • https://uploads.strikinglycdn.com/files/8bd5f6f8-d19c-4c57-8d42-f972a74a317f/fonobek.pdf
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_501d16fb663e4ac4b3361d2198d0c397.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000287ee.bin
b3c05e90c669ea8d39ce85d78c5d9d9301f8fe7c014b103d728a8ddada9e94b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x287EE 63012 bytes
font_01_sfnt_off00034759.bin
27adf522306866e1fd28a51f9af32b743f1bbb7c9e579f0cd9238d21551fbb39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x34759 5592 bytes
font_02_sfnt_off00035a4f.bin
3ea19a1bd43648dadc1576abfd004b3ed25234055de330b81871a3e10bf7d138		 pdf-font-stream PDF embedded font (sfnt) at offset 0x35A4F 17000 bytes
font_03_sfnt_off00038db3.bin
0318b400cbd4eb80818b7eb131bcca2e18f343f850c5eb1573e525fea31f4d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x38DB3 16204 bytes

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