Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de10eed0a243e74…

MALICIOUS

PDF

65.9 KB Created: 2021-02-22 11:03:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 14a2b23b169c20d58565edc83df2ffd1 SHA-1: ed46adcf05605d176a4d5cc76076f6a8bea61e8e SHA-256: 5de10eed0a243e74efc640af3d4a892f419463894e8ac623ef4ef7f430a9d53f
146 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The malformed stream length heuristic further supports exploit activity within the PDF structure.

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://baarspo.ru/123?utm_term=delta+monitor+shower+cartridge+rp19804 PDF link annotation
    • http://eferevole.com/act_english_practice_test_4_answers08yxt.pdfIn PDF document text
    • http://fakosujonipej.iblogger.org/chandrayaan_2_images_with_information.pdfIn PDF document text
    • https://butiriretife.weebly.com/uploads/1/3/2/6/132681404/vawadikovopoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_6019f183ef711.pdfIn PDF document text
    • http://kitapusowa.22web.org/66724066249.pdfIn PDF document text
    • http://trychambre.xyz/avast_antivirus_for_android_tvb7gfp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415742/normal_6016014a985b3.pdfIn PDF document text
    • http://vagokij.iblogger.org/59759387248.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451752/normal_6001ba26b363d.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/masukofovemononona.pdfIn PDF document text
    • http://lexaliki.22web.org/zanusi.pdfIn PDF document text
    • http://glossywp.online/eden_movie_2014_parents_guideb8ux5.pdfIn PDF document text
    • http://rexirututesopew.iblogger.org/soxiperisilipozezemuva.pdfIn PDF document text
    • https://muxupodijem.weebly.com/uploads/1/3/4/8/134885552/964328.pdfIn PDF document text
    • http://alexandreablog.com/39802327189gsetm.pdfIn PDF document text
    • http://asta-stroy.ru/96013358699o5lyy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wukosinigi.epizy.com/asma_bronkial_2018.pdfIn PDF document text
    • http://jagogapibibolin.epizy.com/26617819776.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE4 6212 bytes
SHA-256: b9f4cfa60559b17f7032fffbda316a8ab6bb97b2aef1dc87fd7c44094ea6d1eb
font_01_sfnt_off0000d4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 10472 bytes
SHA-256: 52948295ff90eaf48498a21ea81f22d73c80c8c2defc8217a96c021904d490ea

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