Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fa5cfbf0923c9b…

MALICIOUS

PDF

154.7 KB Created: 2021-06-14 14:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ac77f974eb4564ec313918759cb2ee6e SHA-1: cb1cf83fe7e242fc22d0f2f78e153505d94a9dd0 SHA-256: a1fa5cfbf0923c9b5122651af465ba994827c432b2c9032220198ba7c38feb71
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 0.9974

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://pistant.ru/pbw?utm_term=manual+agisoft+espa%25C3%25B1ol+pdf PDF link annotation
    • https://balalowomave.weebly.com/uploads/1/3/0/7/130738893/levefek.pdfIn PDF document text
    • https://rigefenasoje.weebly.com/uploads/1/3/0/7/130776330/7247a43.pdfIn PDF document text
    • https://weginufakitin.weebly.com/uploads/1/3/4/8/134846544/f61c8381.pdfIn PDF document text
    • https://liritetujom.weebly.com/uploads/1/3/5/3/135310948/482482.pdfIn PDF document text
    • https://dakuxemi.weebly.com/uploads/1/3/4/8/134883968/gixagaz.pdfIn PDF document text
    • https://livadekawa.weebly.com/uploads/1/3/5/3/135317457/9ce3ddcc8e24.pdfIn PDF document text
    • https://kavosimodo.weebly.com/uploads/1/3/4/9/134901779/wobik_nupelefefopeza_givinikuzujebaw.pdfIn PDF document text
    • https://dofufegudi.weebly.com/uploads/1/3/1/3/131381881/7ec12d3.pdfIn PDF document text
    • https://bomusega.weebly.com/uploads/1/3/4/6/134656079/kapizulivedelijokijo.pdfIn PDF document text
    • https://fukorolavo.weebly.com/uploads/1/3/4/6/134639224/wurefamo.pdfIn PDF document text
    • https://wutodifutatur.weebly.com/uploads/1/3/2/8/132814097/bejubeke.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/06b48cb6-3486-4cd0-8c81-38dd8d8db294/93336962741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44912dad-a22b-484e-a035-cae4b99b047e/38524393105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d24a605-d3c6-4014-805a-0ae1e912370a/how_to_fill_out_cricket_score_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a803974-9e3a-468a-a96a-f2fe6416c9a2/52438892538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab09cbe-384a-4886-a9b2-0bb81cff3f89/15mm_fantasy_wargame_figures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0917203-6685-4a15-acf7-529a19d5db71/data_warehouse_concepts_design_and_data_integration_quiz_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/476a6be9-8512-4ac7-b721-9a72eb717ded/how_to_set_up_polk_soundbar_with_alexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f1e307d-9e9b-4dc2-9a7f-558aaee34b57/88293806659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f149dcc-68fc-4db3-b3c1-2d7e879f52b9/garaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b916f2-d752-4d47-a72e-db201991c973/kwikset_smart_lock_909_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e88b53-9efd-4987-8483-8d90ccbe04a9/dizenazasavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a61b607-84b5-4f69-8723-cc2c9a45a857/quran_with_urdu_translation_and_tafseer_audio.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_off00021a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A06 5332 bytes
SHA-256: 8621c19c8d8cea5f19506502b69e186d7213637b8e62209a00a9e8e851ee80c3
font_01_sfnt_off00022c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C0F 14472 bytes
SHA-256: 5930c0393258b9c2b984432c3e3cf7824c472d8dcccf3ff989458f2602b5731e