Malicious PDF — malware analysis report

Static analysis result for SHA-256 99578718b93ff245…

MALICIOUS

PDF

76.7 KB Created: 2021-03-22 03:21:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 52f6715948bf867ecf0bc1634a8b97b8 SHA-1: e1b10261a5f251e7888c14760b8b39878516ed13 SHA-256: 99578718b93ff245a6f03a4c6beae64c9218237f2b2dd5100463b3115adf4533
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO poisoning tactic. ClamAV and ML classifiers strongly indicate maliciousness. The embedded URLs suggest an attempt to redirect users to potentially malicious sites for phishing or malware delivery.

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://nipisod.ru/award?keyword=bourns+3386+datasheet+pdf PDF link annotation
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/a9cba.pdfIn PDF document text
    • https://fexatawolev.weebly.com/uploads/1/3/4/4/134445796/9815589.pdfIn PDF document text
    • https://zomereke.weebly.com/uploads/1/3/5/3/135397468/nipekuvegexav.pdfIn PDF document text
    • https://walanugenaxoduf.weebly.com/uploads/1/3/5/9/135964425/wunudunatemakovixil.pdfIn PDF document text
    • https://xejuzofuna.weebly.com/uploads/1/3/4/8/134858051/pufavekagimafijujawo.pdfIn PDF document text
    • http://uaportal.site/abba_knowing_me_knowing_you_sheet_music31283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5fd660a8aee02.pdfIn PDF document text
    • http://usejus.pro/wheel_of_time_mapv3lbr.pdfIn PDF document text
    • https://zelejipez.weebly.com/uploads/1/3/4/3/134353750/8e9064926ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426087/normal_600407659c506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370284/normal_5fd1c7446c508.pdfIn PDF document text
    • http://smotrikino.fun/fuvuro7kvti.pdfIn PDF document text
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/3823689.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/dd441bba-e599-4068-acef-4ee888108cb1/ed_sheeran_and_justin_bieber_i_dont_care_lyrics_az.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/9749933396.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/glioblastoma_multiforme_stage_4_death.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/free_cursive_writing_chart_printable_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/eternally_silenced_pinot_noir_tech_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f47f9e77-2f37-4299-9ee9-89843344f704/wu_tang_clan_american_saga_cast_members.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc139a4-3494-4f5a-8cb1-c85237043aab/tutorial_asp_net_mvc_5_espaol_viewer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A7 4324 bytes
SHA-256: e90a14e73565ba88b36963f6fc6f879e1bd1a94b9e6cb7521e1713036b1e2dcc
font_01_sfnt_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 5660 bytes
SHA-256: 7801f88024c962df09979601b10f0b1b6180849736dc6e8601c51be9e38d60d9
font_02_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 13468 bytes
SHA-256: 31f4faf92ddd06889138a6577a59c14ee04a7af1f5de3cacc06822dbded3322a