Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f8af55e1d8f5b3…

MALICIOUS

PDF

77.1 KB Created: 2021-05-31 20:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d735bfba9e55b12f63890bec4df7e543 SHA-1: 16cd326b9dd0c91f865d6982c5fd0793d73d64c9 SHA-256: 97f8af55e1d8f5b3a27b76ac9b1b2214caafa2ac548356bc0d995f404045e389
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 0.9996

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://ponafet.ru/123?utm_term=check+iccid+number+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475580/normal_6063ad0470ac9.pdfIn PDF document text
    • https://tigizojotajubum.weebly.com/uploads/1/3/4/4/134489046/lenufedi.pdfIn PDF document text
    • https://riwitasaroxaga.weebly.com/uploads/1/3/4/6/134656256/2ac4abd.pdfIn PDF document text
    • https://fitadidexedas.weebly.com/uploads/1/3/5/9/135977916/2365183.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_6004351a4d5ba.pdfIn PDF document text
    • https://wabavavopip.weebly.com/uploads/1/3/4/3/134317653/gopir-xixuzanov-gibepojedaf-nesesolofaso.pdfIn PDF document text
    • https://xuratofojiwob.weebly.com/uploads/1/3/4/0/134096374/8650677.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nowefuro.pbworks.com/f/how_do_you_find_the_median_of_ungrouped_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f651e479-25c1-432e-8b99-a3aca55f09e3/brother_pt-1290_tape_refill.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144420567/mibezusaveno.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/f/saps_psychometric_test_2020_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4561458-6c9b-484d-8d70-b8d46abc54fd/nedagadavesavegiluriraxu.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/how_many_combinations_with_5_numbers_1-45.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/758de53f-203b-4d57-8785-511519050113/what_is_recapitulation_theory_of_the_atonement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46702566-c843-40aa-97c6-96d87b4e8cfc/jixitarevozixabatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/398c066a-d27a-4776-b70a-bd5035666ef3/how_to_use_technical_analysis_for_trading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79bba90c-dc7e-4cd2-a4b5-307afdae2f5e/28774776581.pdfIn PDF document text
    • http://wamotarirup.pbworks.com/w/file/fetch/144422865/60025668458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f7fe73-2660-4b2b-a2f5-26696f77c3c8/how_to_embed_poll_everywhere_into_powerpoint_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c305b0-9d1c-4522-84e2-2820d022638e/difference_between_direct_and_indirect_coombs_test_in_pregnancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9278a2cf-d9d8-429a-83b2-047ad3b57af2/monthly_financial_report_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0df9b85-989d-4b02-8bc7-8960c6ef7105/50581385303.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_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 5076 bytes
SHA-256: ddb721b02d06e2719133e322410130693f8e47a96047d3bf69b87d266283e35c
font_01_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 10772 bytes
SHA-256: 9cbbf0e0ae967b24707f34871a13d36974a4e29ef079f7381fee98a9a50a1e9e