Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9dd87c9e802fb8…

MALICIOUS

PDF

78.1 KB Created: 2021-04-24 17:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9989c1c2838b263e46a407402943a2b1 SHA-1: 09d834223b7114132f910a711dcc5ebcd592396f SHA-256: 2f9dd87c9e802fb89a9e0ebee3cc7d6ac3a7c5035751d83a0695a2745237b403
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary malicious URL identified is https://pelibifir.ru/strik?utm_term=how+to+study+for+teas+test, which is likely used to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=how+to+study+for+teas+test PDF link annotation
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/45f19f29aa7f.pdfIn PDF document text
    • https://nikalakikezune.weebly.com/uploads/1/3/4/7/134753818/telesija_mexefiramalibot.pdfIn PDF document text
    • https://bafejaligaxe.weebly.com/uploads/1/3/4/0/134018432/8ca79eaa1.pdfIn PDF document text
    • http://xelibirujegid.mywebcommunity.org/invasive_blood_pressure_measurement.pdfIn PDF document text
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/2c4813140d.pdfIn PDF document text
    • https://sopidafepu.weebly.com/uploads/1/3/4/7/134744384/pisetowopubaxopo.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/9080b60c-6da5-495d-9cff-11399615df5f/does_splat_make_your_hair_fall_out.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/2687001865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adc1b109-2542-4ad1-a588-ef1fe55723e2/what_is_step_6_in_na.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/final_cut_pro_slideshow_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/asmaul_husna_latin_dan_artinya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e75c3cdb-43f0-4895-ae7b-8bc19761b377/98212297907.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/lubricating_jelly_msds_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70756b40-1321-4b97-97b0-f1fa3425a106/does_retin_a_remove_stretch_marks.pdfIn PDF document text
    • https://a208a2de-cee2-48c2-86e3-c620a022946d.filesusr.com/ugd/dda32d_e918c95e68a94791a8165395ebf30a07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d87368-f7f7-451e-a6d7-f9213a01e680/84792892113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b11ffc9-69fa-496b-9798-8b6fca0adea3/the_secret_book_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58342cf8-6e49-461b-b05c-53e85920b901/59212178273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f06009-a58e-4b8c-b118-470335e54659/83248216317.pdfIn PDF document text
    • http://lugenizuridaj.atwebpages.com/amplified_hebrew_to_english_bible.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_365fcf423ecc4ea7b3590e88c23f0e3a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nowonovege/abir_gulal_full_song.pdfIn PDF document text
    • https://aa0e52d0-3c12-4d86-bfd3-e3284f950a51.filesusr.com/ugd/eb1974_a3565446e6cb47158c00c21ec5356aa0.pdf?index=trueIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/optomcas_personal_statement_example.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_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 5024 bytes
SHA-256: 145af4de6fd3348c07f68ccffde0a0d836ff988075ffcc666dc041fa0355cb6a
font_01_sfnt_off000104a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 11092 bytes
SHA-256: e810e2c9114197e7005b44574d3cb452686522b9d81d9b3c8a0e76e633e92a38

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