Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1925a2e332d54cf…

MALICIOUS

PDF

84.3 KB Created: 2021-05-10 08:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bd3c956877245bfbf6efa362b7aed92e SHA-1: 56924b60c1bfed6bcd25d5e69e73ed658657b3f5 SHA-256: b1925a2e332d54cfb63a3a122202a917c8307ddfd9bd6d3314b1e7b0332d8944
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The primary malicious URL identified is https://mezovuduw.ru/strik?utm_term=motorola+sl7550+programming, which is likely used to redirect users to a phishing page or download a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/strik?utm_term=motorola+sl7550+programming PDF link annotation
    • https://kegozorud.weebly.com/uploads/1/3/0/7/130740561/1352110.pdfIn PDF document text
    • https://wabirigiraziw.weebly.com/uploads/1/3/6/0/136017191/jukawifez-nodudowenuw-jebajiwegup.pdfIn PDF document text
    • https://didukomam.weebly.com/uploads/1/3/1/8/131857465/gukorereworelavumal.pdfIn PDF document text
    • https://kedadatiwuji.weebly.com/uploads/1/3/4/8/134891749/wejene_gikirukala.pdfIn PDF document text
    • https://ginuwedisifixel.weebly.com/uploads/1/3/4/7/134744372/722b684ca85.pdfIn PDF document text
    • http://xelamoxadavas.mywebcommunity.org/advanced_excel_2020_formulas_and_functions_with_examples.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sitozi/imo_app_free_for_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92150df5-2c1e-4a06-8b31-94ee375c92aa/tablet_lg_g_pad_iii_10.1_fhd_4g_lte.pdfIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/factoring_polynomials_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/bangladesh_army_job_application_form_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e649897d-07e9-491c-a3a9-f6c2c03f8fa0/how_to_remove_pimple_marks_from_face_home_remedies.pdfIn PDF document text
    • https://53ee2ee6-42da-4c96-954f-60f726bc8d53.filesusr.com/ugd/de2744_aa18748d5cc643edad15896a7bf78d03.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokixetat/budget_analyst_job_interview_questions_and_answers.pdfIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_84d2cc93d4674f719c9fd74222254b03.pdf?index=trueIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_1dd91d438f404110ae79502c2a3209d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ecc4af0-e31c-48da-92b3-dda5925c79d2/5143615870.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_8aac4da4e5e84e8bbd68c1cc05885b7b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/117d9c66-af7f-411d-818c-123e7c08aa19/44473967030.pdfIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_14b05222714c4a0298e8033d3bbc2d91.pdf?index=trueIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/yasin_sharif_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0fed4c3-280c-4acd-98e5-58a96f63e95a/10206734786.pdfIn PDF document text
    • https://b27aca93-056c-4dd2-83a6-fd909c9f709d.filesusr.com/ugd/2ba3ac_4e07f0424f304350a449fbfa993e723e.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_864cd8038ce54ca194e80e1a82390e91.pdf?index=trueIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_f219a6b5b20a49ae91812f82b5cae369.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9D 5160 bytes
SHA-256: e8533a183160d005d2d9bc0b85af95f6a160c675649d91984700773b79de7b3a
font_01_sfnt_off0001100c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 11016 bytes
SHA-256: 1aeb1795d89e649ca760c41edcfb2052cf1a5d9e4c729ac044655df525a0802e
font_02_sfnt_off000135ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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