Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf87c9de500f49e6…

MALICIOUS

PDF

74.5 KB Created: 2021-03-09 20:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2003671cd8cdf1d4a7b6b49c7e9328a6 SHA-1: bdb29b4bf613101855ab25a8df1f0c8885232ab8 SHA-256: cf87c9de500f49e667a728bb5217e088a2ac182d56eb45ad75c538b97a3b5605
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=grocery+store+business+plan+template PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486367/normal_5fc7c4a442db8.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/how_to_connect_directv_to_fire_tv.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/what_is_planning_in_construction_industry_authority_of_the_philippines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_600d1cea7d342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404725/normal_60157f7e7babf.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/prefix_and_suffix_worksheets_for_5th_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_60274b7793724.pdfIn PDF document text
    • http://timujegewaverun.22web.org/kinujikatibewugam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_33897df8d9414d80bd49bdb774b8d97b.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_445429d43a50460ab4a093a59fa323df.pdf?index=trueIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_dca2b5518dbd4413b6225e1fd9ac5d29.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomuper/dikikojezubaki.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_a5e529c0cbf244b8925fcded74bb4faa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bakoloj/35767532727.pdfIn PDF document text
    • http://sawurawefivovo.myartsonline.com/best_targets_for_200_yards.pdfIn PDF document text
    • http://nazifaba.rf.gd/xeminobekixewesijadeba.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/toulouse_rugby_team_sheet.pdfIn PDF document text
    • http://tipokeviti.atwebpages.com/100_chart_games.pdfIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_2a4fc67c3a0746d9b8e2f10121ca06fc.pdf?index=trueIn PDF document text
    • http://mubufelijora.epizy.com/acca_f9_study_text_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/el_proceso_de_investigacion_cualitativa_y_cuantitativa.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/27316918002.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_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 5352 bytes
SHA-256: b170dfc9b5123bc1efdefe4fe3618a31acd60ad2b0bded73e0fd9055649e3a66
font_01_sfnt_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 10944 bytes
SHA-256: 2419f6b3c2eb2e9f92aee18ab3a6da8db475c1cc12df534bec85b248e8f861d6

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