Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a0d96bffe14395…

MALICIOUS

PDF

79.7 KB Created: 2021-04-01 03:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d4882e1b1f628f467512705d0810643d SHA-1: 9e1532daaa5a294e6eb167dc12e0d59ef158fd63 SHA-256: 42a0d96bffe1439519fb6b7e9c9ffb00dd3a273c901847963fbb2d4e1b619d59
126 Risk Score

Malware Insights

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

The file is a PDF that contains obfuscated text and multiple external URLs, with one URL pointing to a disposable hosting domain. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://soxebez.ru/wix?keyword=waialua+high+school+staff+directory PDF link annotation
    • http://bonifacy.site/kupameral2ctp.pdfIn PDF document text
    • https://xidoteruredogon.weebly.com/uploads/1/3/1/4/131454367/6384446.pdfIn PDF document text
    • http://hookup755.fun/880870519702s6k.pdfIn PDF document text
    • https://xuzipitazejaj.weebly.com/uploads/1/3/4/7/134722028/c84b68025.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gebukil/algorithm_analysis_and_design_techniques.pdfIn PDF document text
    • https://54fa3baf-6954-44a2-98df-2137f0cc340f.filesusr.com/ugd/14b79e_2c9239265d88438180a2150ebf67cfb5.pdf?index=trueIn PDF document text
    • https://bd04a250-715b-4db0-8087-55ec2f714cf5.filesusr.com/ugd/0c2191_b45894fc89cc443f86f3e23ee7b5638c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5ad32b-e075-4869-904f-0eabca2e98ce/51696148216.pdfIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_caabb7fab2ae42d6a94b80ba9033efe5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wanalovum/tejiximeripukepevujelul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca33136-bd62-4c49-90ba-319bbf762ce1/linden_travel_alarm_clock_made_japan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90a09deb-e939-4264-a20e-175245677e9f/check_your_english_vocabulary_online.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/66565720489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/748d0814-d34a-4da0-8961-4b339c6aaaef/38103005855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60812339-1e05-4e27-a896-6fa5db0b0970/wiledabanupogal.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/tabalubupamovaxazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c351affe-96c5-4feb-9602-c117b79b4edb/wizexinugamajumeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ead951-cdc1-49be-8502-7225f1f4de0c/identidades_trigonometricas_reciprocas_definicion.pdfIn PDF document text
    • https://a1bd7baf-2de3-4c81-8914-4b74a732ecf9.filesusr.com/ugd/c89f15_1392ed930c7048118e0847a1720baf9f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/kagetokejerijikejazupi.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_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 5400 bytes
SHA-256: 448a8fc65b6288645787472e33ec0c8630c72cb439807e4a5e36690e37902617
font_01_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 11272 bytes
SHA-256: 9a984818853a1339ce005e856ee38274c2add2602a1f37a2706c1d67df645cd1
font_02_sfnt_off00011cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC5 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74