Malicious PDF — malware analysis report

Static analysis result for SHA-256 555d55fd53398d0e…

MALICIOUS

PDF

73.5 KB Created: 2021-05-15 16:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 395b651a1dd5d23b8314d3ef8a36d23c SHA-1: 7853d57f4d912920d749c15c06db5de4439a0fc6 SHA-256: 555d55fd53398d0ed678d5896bf8066e9db0a5c943da42d03ec389b559b2e2a1
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to 'shop vac replacement toggle switch', which is likely a deceptive tactic to encourage clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=shop+vac+replacement+toggle+switch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472182/normal_6056c22cc7382.pdfIn PDF document text
    • http://pejazadajenatew.getenjoyment.net/how_to_think_about_weird_things_8th_edition.pdfIn PDF document text
    • http://puzexijabin.mypressonline.com/what_is_discourse_analysis_theory.pdfIn PDF document text
    • https://cdn.sqhk.co/degavorofala/ejiibFd/zewunu.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/arcing_horns.pdfIn PDF document text
    • http://bestita.space/lopisafexosersepb8.pdfIn PDF document text
    • http://venira.su/vitamix_a3500_ascent_series_blender_manualnc313.pdfIn PDF document text
    • https://cdn.sqhk.co/wanazofemuvu/hd3gejg/jugurekanudeguwipa.pdfIn PDF document text
    • http://roxopazin.iblogger.org/cultural_anthropology_journal.pdfIn PDF document text
    • http://basiditdcf.space/36168344350z3qt5.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/gipub.pdfIn PDF document text
    • http://jijoxep.getenjoyment.net/esl_appearance_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493545/normal_601644571bfe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381756/normal_60557ac62f2a0.pdfIn PDF document text
    • http://fesufobototezer.mywebcommunity.org/topographic_map_assignment.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_600a3bbb920f1.pdfIn PDF document text
    • http://onatural.space/career_paths_in_psychologyt9x6u.pdfIn PDF document text
    • https://cdn.sqhk.co/maduzonuxoke/8dijjap/47493600379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477623/normal_6028a7a2e0939.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kifavudufolafu.epizy.com/workplace_bullying_article.pdfIn PDF document text
    • http://wozawexopad.epizy.com/vuxav.pdfIn PDF document text
    • http://kibeloveze.rf.gd/48755819033.pdfIn PDF document text
    • http://romofimor.onlinewebshop.net/87977927114.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_off0000de3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 5600 bytes
SHA-256: 2f4be6ede67a8b8a77a53e2be7542d759909a0a9429b5611a2b2174b9310523e
font_01_sfnt_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 11712 bytes
SHA-256: 3bc9d407fbae7e61cc359ded04672b7864649edb5766c70ba72bd89543b24ef4

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