Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1cd54e060de209…

MALICIOUS

PDF

79.8 KB Created: 2021-04-11 01:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 96f4e584da98261ffd5f4124c56cbc1f SHA-1: 70c243aa177a1057104cda4d81072376e93df65f SHA-256: 9f1cd54e060de2090b47e2a93659fc6644e385baba91da7fed00ff687999084f
126 Risk Score

Malware Insights

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

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 0.9990

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://soxebez.ru/strik?utm_term=estructura+de+un+texto+narrativo+es PDF link annotation
    • http://pe50off.info/night_shift_brewing_boston_ma8cf61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479470/normal_603bee3ce9cc1.pdfIn PDF document text
    • http://espaceabone.com/adobe_reader_create_onlinejdd4t.pdfIn PDF document text
    • http://srakan.space/datelepetajulopekadirob4n8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365635/normal_5fc6e0e01a3d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_602df5421e587.pdfIn PDF document text
    • http://koprovk.xyz/how_to_start_gardening_at_home_for_beginners3jwk6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426686/normal_60176ebe733d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366639/normal_5ff6623375210.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409123/normal_5fce4757b81e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_6017242b9de32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_60040b25a577d.pdfIn PDF document text
    • http://faceit.su/sigma_1009_sts_instruction_manualgnn2t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464529/normal_6048401f93187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_606309e94a271.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_64c35ade433443e0b42b4cee278e1a3b.pdf?index=trueIn PDF document text
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_dca96cc7906e404ca1a40e8cf5f57e18.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7da839cd-8120-4ed7-8812-72274c01bed6/78274005310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb695d9-8b60-4b03-bb47-c583349e46df/4998531574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86259794-7f14-4e9f-b8a8-1dcca12459b8/oral_b_electric_toothbrush_which_one_is_best.pdfIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_e72ab5f1634e4953ac1448c54f0d93fd.pdf?index=trueIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_71d082f9b5094d1987bdc1a939960320.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/pipoxuluvoniru.pdfIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_4c4e124514da4a9eb45cb3ee2412f923.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/inclusive_growth_report_oecd.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_off0000f9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CB 4984 bytes
SHA-256: 32e5c175b62042aff93a234deaae4683b1d6d3aefd0c61619b4bd903322df02b
font_01_sfnt_off00010ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 11776 bytes
SHA-256: 63bb71d90e9011809b94b5ed8a60f833bcb5024a6b5b4bfc484c6adbeabecdbb