Malicious PDF — malware analysis report

Static analysis result for SHA-256 d483458c883b7800…

MALICIOUS

PDF

98.7 KB Created: 2021-03-10 20:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1332ac899c7bf1ffe2c91674deee317e SHA-1: 9c09442187a57774696cd54e12b06afb36c8ec89 SHA-256: d483458c883b78007a087396ad692a66ee59ae7fe719b57c5601574b9981db3a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9992

Heuristics 5

  • 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://fokemale.ru/strik?utm_term=le+petit+nicolas+full+movie+online PDF link annotation
    • https://rimokukesezawuk.weebly.com/uploads/1/3/1/4/131437069/35b5d6c072c.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/calendario_octubre_2020_chile.pdfIn PDF document text
    • https://voloripilobolim.weebly.com/uploads/1/3/4/6/134635915/fa906361dfd6.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/digiland_10.1_tablet_dl1036_case.pdfIn PDF document text
    • https://ginimowawogob.weebly.com/uploads/1/3/4/7/134753870/1198498.pdfIn PDF document text
    • https://kegotewu.weebly.com/uploads/1/3/1/4/131437679/676101.pdfIn PDF document text
    • https://siroxaje.weebly.com/uploads/1/3/4/0/134000026/076a0e.pdfIn PDF document text
    • https://cdn.sqhk.co/gediwuwanol/hhjihha/faxanixewotaxunivakus.pdfIn PDF document text
    • https://cdn.sqhk.co/kinubowa/gdihEH5/ragnarok_tactics_guide_psp.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/c14bbef0-c65e-4367-98af-50b0841521af/failure_to_record_accrued_interest_expense.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/94754333465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f2c553-2401-4212-943d-07f6e5f9a078/99812923546.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/decimals_percents_and_fractions_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ab013b-7a4f-4688-9bbf-2f5544964588/polaris_side_by_side_170_top_speed_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cbc390c-2e52-4dc6-a47e-bfb147346c7e/95022811555.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/avatar_full_movie_tamil_hd_isaimini.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/bolududa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb1400f0-c2e1-4ff1-b799-0b5eaac39e81/62467316023.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/pittsburgh_police_zone_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6514ce9b-74a5-4d59-9f16-ed67ec4e4aca/zofefawupurujitujazotokuk.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/lagu_kartonyono_medot_janji_adella.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D9 5068 bytes
SHA-256: 3967ef50ed4c4ab7e5168f5ad292843bb04e54f135d34c1c358d1d67a0f63a48
font_01_sfnt_off0001360e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360E 3140 bytes
SHA-256: e0dfafe4073563fb8c9d8c9f11f4c82fbc8c0fc49a4681fedf4cf8a5bf9cb2bf
font_02_sfnt_off000142fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FA 10572 bytes
SHA-256: 00fcf10cf88d93c4b3619c6652b7c9faffe439ae7ac6774771761c87b0863016
font_03_sfnt_off00016747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16747 16116 bytes
SHA-256: 30f7b736c9932a83602df7fb8bf31fdd88e662ef870aa3ee0e8df85eeaf43048