Malicious PDF — malware analysis report

Static analysis result for SHA-256 380f048126f4e484…

MALICIOUS

PDF

76.1 KB Created: 2021-03-22 17:33:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f58cd688ce5b1c40cc5e1c0a1966808f SHA-1: 5f1a8e8b3757758680896ba54e083b44605c6235 SHA-256: 380f048126f4e484ad8a98e73b6e7f46a1a2a1b696ffdc52eeea861701f12192
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/award?keyword=critical+thinking+skills+book+stella+cottrell+pdf PDF link annotation
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/3207393.pdfIn PDF document text
    • https://rokawutavepuma.weebly.com/uploads/1/3/0/7/130776645/950673dba4d243a.pdfIn PDF document text
    • https://pevunefimexog.weebly.com/uploads/1/3/1/0/131070247/2051036.pdfIn PDF document text
    • https://jeduwisuduxib.weebly.com/uploads/1/3/1/4/131483356/sarosolagedevut.pdfIn PDF document text
    • https://tutuludoj.weebly.com/uploads/1/3/0/8/130874598/xoxulof.pdfIn PDF document text
    • http://tevaruv.sportsontheweb.net/azure_data_factory_v2.pdfIn PDF document text
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/tuxorugelevi-tojimojorezov.pdfIn PDF document text
    • http://gebojujefe.22web.org/razer_blackwidow_ultimate_stealth.pdfIn PDF document text
    • https://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/noloxogivivizopadusu.pdfIn PDF document text
    • https://modudipagif.weebly.com/uploads/1/3/4/6/134688888/seditebulobalinuji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kixomeremit.epizy.com/gmu_advising_sheets.pdfIn PDF document text
    • http://sobogasitizi.epizy.com/how_to_cite_a_case_study_in_apa_format.pdfIn PDF document text
    • http://nasuxenabo.epizy.com/almost_there_the_platformer_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/19177249833.pdfIn PDF document text
    • http://toredikavuwu.rf.gd/plc_ladder_logic_programming_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e16dc74b-2ab0-4443-beed-5a7db53e474d/94098452065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e6df555-4b01-41fa-8505-6b5f16027317/33200163070.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/online_challan_form_fpsc.pdfIn PDF document text
    • http://medexode.atwebpages.com/36946326850.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/girdling_fruit_trees.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/bracket_leaders_of_tomorrow_lyrics.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_off0000eb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 5524 bytes
SHA-256: 07958dc397d63faabe9aee9f3551cd88f02a016f780ad3962d1aca4a192862f7
font_01_sfnt_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 10852 bytes
SHA-256: c7478c357f761e107455e60ec0ff5ed5820206da38412a1463f72ca39107ddde