Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcd0b16fe80e97c…

MALICIOUS

PDF

76.8 KB Created: 2021-03-28 20:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9788be7afe962b7afe855b2588896c1d SHA-1: e958b873f3b81337597ae8be955f8339d443b424 SHA-256: 4dcd0b16fe80e97c4fcdb5e047b005967a7dfe66338ee2bfa88349e73da39866
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=nostalgia+ice+cream+maker+user+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489247/normal_6009245928f9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5fef50a7769cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393511/normal_603418f836a87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464521/normal_5fe6e1f824f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_604f2abc91b22.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/isjjjQd/lejixaxepilepuf.pdfIn PDF document text
    • https://cdn.sqhk.co/katafojedul/iicijgh/tap_titans_2_how_to_use_artifact_optimizer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_5fe9f778a5916.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/igjogi7/nixotaxap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_6009f2568df52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474192/normal_5fc7b694acd00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d0bab9a-e605-45a7-b8b8-f75b151f0d03/the_rich_brothers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/576b89a5-3cf9-4386-939d-1aa2019c785a/how_to_make_an_ebook_into_a.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/i_put_dryer_sheets_in_my_shoes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b12ddafc-2e27-4afc-8ebf-0f0e0e762126/fifth_grade_book_review_template.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/where_can_i_buy_yellow_rose_plant.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/free_social_media_calendar_template_2019_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/75716289952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/591052e6-2f80-4dcb-9880-28a8aded617d/2018_toyota_camry_se_hidden_features.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db6a5ac1-0f8f-49ab-9278-2d5b1023277f/38480457798.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/kejula.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_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 5152 bytes
SHA-256: d115b9be724d50584273d85e481098e68768e4d3ea20835131e6fff6d1f1b309
font_01_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 10952 bytes
SHA-256: 77cfbcd8861db1a91b5cdbb9312f0c652b85e70924820250ef446d81b566a0a6

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