Malicious PDF — malware analysis report

Static analysis result for SHA-256 356f67b477a3d4d6…

MALICIOUS

PDF

73.1 KB Created: 2021-03-26 06:45:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b0c1520b3ec9baab2080a677d0f1013d SHA-1: 92383ff3eda91d18fb3815573fd2d04103077f8e SHA-256: 356f67b477a3d4d65cf78ffdf8f10132881cc8279b8426fca62b9ee95669778a
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=woolly+butterfly+bush+propagation PDF link annotation
    • http://jawazapefaxuzit.mywebcommunity.org/basic_electronics_mcq_questions_and_answers.pdfIn PDF document text
    • http://tejidirexe.mywebcommunity.org/72870464189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417139/normal_602b8cdfe4472.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466679/normal_5fdda17a36193.pdfIn PDF document text
    • http://namumexazezi.22web.org/books_to_read_online_free.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/leteraxewe/polytune_2_manual_espaol.pdfIn PDF document text
    • http://nezebur.epizy.com/jogovuxamuxesitividolit.pdfIn PDF document text
    • http://gumomexad.onlinewebshop.net/88701861567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d830f7-ba35-4000-9f67-97e571046909/wamutofereravetumuriwete.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/lutulebidid.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/sedixegamegutasavo.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/80067717456.pdfIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_76b348434e48402f8d7d3a8276f0b7e0.pdf?index=trueIn PDF document text
    • http://putuvapade.epizy.com/archangel_s_heart_free_download.pdfIn PDF document text
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_d56f109f4d704c15b5c8653939f17446.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d88129ad-05ae-4c16-aea9-c8f4e1b5bad0/dell_inspiron_17_5000_series_weight.pdfIn PDF document text
    • http://wegepuzil.epizy.com/excel_advanced_exercises_for_students.pdfIn PDF document text
    • http://xusizifonuta.rf.gd/52930391207.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/amaranthe_new_album.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_off0000dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 5420 bytes
SHA-256: 44a9d96575c1e2df87716d6ba4e6460de45c4d80b682889f7ee82dcb23a0aab6
font_01_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 11116 bytes
SHA-256: 57fe198fd81f71f0542e6502d907171c4c888f41b973b0b5799eb172d1663ede

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