Malicious PDF — malware analysis report

Static analysis result for SHA-256 84887466ecf6256e…

MALICIOUS

PDF

75.4 KB Created: 2021-03-25 17:38:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ba45be104479034a132bf03c7457b7f7 SHA-1: 628703664575a19ac8b97ed6ba48971ed83f67f0 SHA-256: 84887466ecf6256eae412464fdabcedd400212f6473fc086b18eaac52c9c4776
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution scheme. The PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=anker+soundbuds+slim+manual+pdf PDF link annotation
    • http://4bochki.ru/schwinn_comp_bowflex_exercises0anaj.pdfIn PDF document text
    • http://gufutaca3.xyz/vampire_diaries_season_8_episode_8_watch_online_123movieskzeja.pdfIn PDF document text
    • http://winoraama.space/kalukodopadejofanufatu3tsmp.pdfIn PDF document text
    • http://pitushok.fun/biddeford_heated_microplush_blanket_warrantyv2wc4.pdfIn PDF document text
    • http://sacredname.ru/jetblue_carry_on_luggage_size_limitc2s3z.pdfIn PDF document text
    • https://bivorafonesakal.weebly.com/uploads/1/3/6/0/136021739/zobam-gejemofa.pdfIn PDF document text
    • http://re-capital.ru/ms_word_for_mac_free_download4fwj5.pdfIn PDF document text
    • http://medgaj.com/what_is_a_personal_development_plan_in_childcare72z2s.pdfIn PDF document text
    • http://hookup668.site/mijudutozipujul1x2ze.pdfIn PDF document text
    • http://reactivaperu-2020.com/18791848273j9ehr.pdfIn PDF document text
    • http://proba7.xyz/asteroid_belt_information_nasa6re1m.pdfIn PDF document text
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/9473931.pdfIn PDF document text
    • http://alkostore.xyz/246265865367yhq6.pdfIn PDF document text
    • https://wigazivebale.weebly.com/uploads/1/3/2/6/132695242/pizapawel-likaxeperin-bamujomemotem.pdfIn PDF document text
    • http://badoxik.scienceontheweb.net/ischmie_msentrique_aigue.pdfIn PDF document text
    • http://itawegan.fun/how_to_check_voicemail_from_another_phone_vtech33pt9.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/jexezogotinenafogeve.pdfIn PDF document text
    • http://lifegirls.site/carl_jung_psychology_and_alchemystoxt.pdfIn PDF document text
    • http://alifan.store/calls_blacklist_app_for_androidfoy54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 5380 bytes
SHA-256: dd28903a5529833d969bcce778eaab4a7561b364d5401051a6d42054aaedeaa6
font_01_sfnt_off0000ea6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 6252 bytes
SHA-256: 21b234704848fbecab0a56cb0868772fe580bb687489ad2b6fb3f3f80534b503
font_02_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 10744 bytes
SHA-256: a5fb27b7186f26886df80dab7791a616b3cebb3194eb0a93d94f63c9934f40ff

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