Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcb0cfae404bdb3…

MALICIOUS

PDF

87.1 KB Created: 2021-01-18 05:52:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8dfba77e6a681be173203fadd3835221 SHA-1: b48374207063fd682a0c9cdf9a54694333fde81f SHA-256: 6dcb0cfae404bdb344a2c37252ca6e4bc3a6a052735fd46120e6d861cf8ef1ea
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the presence of many external URIs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=history+trends+unlimited+firefox PDF link annotation
    • http://vikunokanafigul.66ghz.com/bodhisattva_cat_true_form.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/9201798.pdfIn PDF document text
    • http://godevibusaxinoj.22web.org/planet_coaster_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393022/normal_5f9f5e7f65a6c.pdfIn PDF document text
    • https://petominezejoza.weebly.com/uploads/1/3/2/3/132303337/jemutemamusiwub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_5fa20ecdcc0fc.pdfIn PDF document text
    • https://besikedu.weebly.com/uploads/1/3/1/8/131871581/37ebdfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423148/normal_5f9c01a175fe6.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/zomuzigo/batchelor_middle_school_cheerleading.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/bahubali_2_full_movie_bangla_subtitle.pdfIn PDF document text
    • http://nisuzadusidu.epizy.com/zuvosatokupametomuzova.pdfIn PDF document text
    • http://zezunas.epizy.com/hd_wallpapers_1920x1080_for_mobile.pdfIn PDF document text
    • http://xugonowelimije.epizy.com/find_the_value_of_each_expression_worksheets.pdfIn PDF document text
    • http://mezotake.epizy.com/vaccines_calling_the_shots_answer_key.pdfIn PDF document text
    • http://bosirizowu.rf.gd/kinixomegog.pdfIn PDF document text
    • http://gekavitominugi.epizy.com/elite_dangerous_fsd_engineering_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/luvuvusowimov.pdfIn PDF document text
    • http://pekotezubefem.rf.gd/xugufamive.pdfIn PDF document text
    • http://mejitakofiragi.epizy.com/programming_analyst_interview_questions_and_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 4976 bytes
SHA-256: ef17d65c29055730b79462ebb0de2640197b94e530216f2c3715876ed78f11db
font_01_sfnt_off0001108a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108A 11796 bytes
SHA-256: 3a8cf81c00b1b105b1eef6b08621c15b7da536d15ada289fc84a45589471a86d
font_02_sfnt_off000138e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E4 16204 bytes
SHA-256: d25787a4c26d5dfe11954a191e1a78b06a4864afc6c230ccab670610fb8eef4c

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