Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd4ad867c3efd8e…

MALICIOUS

PDF

78.3 KB Created: 2021-04-05 22:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 55eb56b47d4cb0a2211d9db3a7449c74 SHA-1: db1098ecca26ae1e61c009002b603b542393dca2 SHA-256: 8bd4ad867c3efd8ec980efca94e75d751ea954952a48296d5231abc25bbb2994
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/123?utm_term=icloud+smtp+server+settings+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495269/normal_5ff4f8fab269c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_60600cf207b81.pdfIn PDF document text
    • http://karivometiw.iblogger.org/causas_de_la_agorafobia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421350/normal_5ff5b27f03045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_60498ec33fc47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409998/normal_60593e1134c96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401703/normal_5ff71a12accc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455194/normal_5fe4813101506.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/fakuguvil/walmart_black_friday_ad_television_deals.pdfIn PDF document text
    • http://lawigut.rf.gd/bendix_king_kt_70_transponder_manual.pdfIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_241eb457594949f88f2c58a583580b22.pdf?index=trueIn PDF document text
    • http://sisawujeza.rf.gd/santa_baby_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/what_to_get_your_godson_for_his_christening.pdfIn PDF document text
    • http://bibesatu.epizy.com/diploma_mechanical_engineer_jobs_in_dubai.pdfIn PDF document text
    • http://wakerot.epizy.com/how_to_teach_phonics_to_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/resource_capacity_management_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/basic_math_accuplacer_practice_quiz.pdfIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_ab09deb2ef684edb8d46dc215f1b7a4a.pdf?index=trueIn PDF document text
    • https://b47237a6-1880-4d87-9598-f01162bab054.filesusr.com/ugd/1fe0ea_5b933a36e8aa45d1a256f1acd51d91ca.pdf?index=trueIn 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_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 5392 bytes
SHA-256: ce24b9d117a6a2ee2b928c9f073ceae6e92d6da6f53d0c5a09945048bc5efc5f
font_01_sfnt_off00010357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 11328 bytes
SHA-256: 6ab73066261aa82a9412b68f7b45a5d34e559fc8adf6ffa4a6f3e50a5384e54f

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