Malicious PDF — malware analysis report

Static analysis result for SHA-256 423a6b99151060a4…

MALICIOUS

PDF

82.2 KB Created: 2021-03-29 01:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5b4bb73c2649a67d65107d0068920d4e SHA-1: 23b92203a844af40b22cc11bd2ef15bdeb89a417 SHA-256: 423a6b99151060a4214673f4f43a3e7e916db16c73e7c45c85e9e2664bd739e7
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external links, with at least one pointing to a disposable hosting domain, suggesting a link farm designed to redirect users to malicious sites. The document body, though partially corrupted, contains text related to 'Harmony booster seat instructions', likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=harmony+booster+seat+instructions PDF link annotation
    • http://fuwenosod.iblogger.org/why_is_my_heat_not_working_in_my_jeep_grand_cherokee.pdfIn PDF document text
    • https://pudevezogezuk.weebly.com/uploads/1/3/4/5/134528534/reboxofexap_rofesavisekoz_rateziku_vawojowotirovan.pdfIn PDF document text
    • https://cdn.sqhk.co/sazobenapur/ggAsggT/baby_manor_baby_raising_simulation_home_designer.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/ijidrii/dreamer_horse_movie_true_story.pdfIn PDF document text
    • http://fekedusotuxena.iblogger.org/97280962991.pdfIn PDF document text
    • https://cdn.sqhk.co/tuteremekome/vgeBogi/marshmallow_fluff_frosting.pdfIn PDF document text
    • https://wezuzaxularo.weebly.com/uploads/1/3/1/4/131406207/2f5f342a7.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/dAJhdfe/98371897339.pdfIn PDF document text
    • https://weworikifuga.weebly.com/uploads/1/3/4/5/134515792/bipokil.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/44d2ba62-7fb7-4b3e-b0c1-b29dffcfdca3/19656001186.pdfIn PDF document text
    • http://wexugemo.epizy.com/loctite_3609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4562932a-faac-4169-97c2-991ef64f6b85/40416836900.pdfIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_50cbd4f897974085869313ed53fcb38b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d4e8184-2a71-41da-8248-c507b58f0893/pergamino_1_el_vendedor_mas_grande_del_mundo.pdfIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_2b675dc15ce74b88a3862ad3c567e99a.pdf?index=trueIn PDF document text
    • https://807eaacf-9fb6-4e16-bcb8-061395d1d132.filesusr.com/ugd/a3ef2e_ddb70a44c9cd4bfe8d008807b2c63443.pdf?index=trueIn PDF document text
    • http://potimafekun.epizy.com/series_llc_operating_agreement_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ff3060-31a1-4404-825a-d4d59698028f/international_marketing_strategy_and_theory.pdfIn PDF document text
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_0e9a0e5ee40e4194a660757ba4066a55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f2a9729-bcf8-408b-bb8b-979271055eba/what_is_the_easiest_thing_to_crochet_for_beginners.pdfIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_675e77dbcfd8491dbcfaf72e97400b88.pdf?index=trueIn 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_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 5116 bytes
SHA-256: 74668944d27568c8107cba0ed3439e0f6db153645de0780cd5edb67664bf8e13
font_01_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 11092 bytes
SHA-256: ed34eef5a4c8ef5c5d699ceb20b5af6cf412e3bbeea43947776f5a146025f0a2